One thing I disagree with a lot of fandom about: I do not think Yuna Hollander would have ever gotten Shane diagnosed with autism.
This might be an age thing. I'm tumblr old, as I mentioned. I was born in 1983. I'm eight years older than Shane and Ilya as characters. I would have been a teenager when Shane was of the right age to be diagnosed. And I do not think Shane would be diagnosed.
The mindset was different in the late 90s than it is today. Folks started finally understanding what things like autism and ADHD were, but also, there was this idea that these things were being massively over-diagnosed.
There were running jokes, everywhere, about how people were "medicating kids just for being kids". There was a South Park episode parodying the idea in 2000, when Shane would have been 9 years old.
And autism was Rain Man. Autism was the little girl in the Babysitters Club books who recited calendar dates and played show tunes when prompted but couldn't talk.
We didn't even have a lot of clearly autistic-coded characters. We didn't even have Benedict Cumberbatch's Sherlock (came out in 2010, Shane would have been 19), Sheldon from Big Bang Theory (2007, Shane would have been 16), or Abed in Community (2009, Shane would have been 18).
We maybe had the ambiguous disorders of Robert Goren in Law and Order: Criminal Intent, which came out in 2001.
Admittedly, I'm talking about American media here, not Canadian media. I don't really know what kind of pop culture representation there was in Canada at the time that Shane was growing up. But I suspect it'd be equivalent.
Also, Yuna has her own issues. She tells the racist GM that sitting down with her family and watching hockey is what made her feel Canadian. She pushes Shane to excel and be visible representation for Asian-Canadians. But at the same time, we don't really see anything to indicate that she or Shane have a lot of connection to Japanese culture. I think Ilya's statement in episode 6 is the only thing that explicitly states that Shane is biracial Japanese-Canadian as opposed to Korean (like Hudson Williams) or Taiwanese (like Christina Chang). ((I don't think "Yuna" is a Taiwanese name, but I could be mistaken. I know it could be Japanese or Korean though.))
And, admittedly this might be more of an American thing than a Canadian thing, but when I was growing up there was still this idea of not wanting kids to be "labeled" or have the "baggage" of a diagnosis if they seemed to be doing well enough not to need additional help.
Shane, I think, would easily fall into that category. He's been playing hockey since he was a very young child. The "scouting and crazy stuff" would have started when he was about 10-12. If they already knew that Shane was in line for a professional career in hockey, then they might not see the point of a diagnosis. It would just make people judge him.
Shane's already biracial, he can't avoid that struggle. But I can easily imagine Yuna not wanting to add more to it. And hell, we SEE that when she and David acknowledge that they've thought Shane might be gay. They THOUGHT it. But they never came out and asked him. They've hinted, but they've never made it explicitly clear that it's okay to come out.
I think that Yuna and David would approach autism the same way. I think if you asked them, they would probably say that yes, they knew Shane had some difficulties socially, and that maybe they'd even wondered if he had something kind of issue, but Shane was doing really well and there wasn't really a point to getting a label attached.