Maybe he stays in the school library for an hour each day so he does the homework, and then know he can game first for 30 minutes when he gets home? I know obviously if he was exhausted from school, the hour may make it all harder but perhaps in the morning?
I've put some links yo videos with overall good, detailed advice for everyone in Y10/11, however I think it's a good idea to start from there, have a look at some of the tips and then adapt for your DS. Lots of them are actually may be useful for a kid with ASD, as they focus on strategic techniques so that a few hours of revision is actually worthwhile.
Personally, I'm not sure how useful this is for him but - make homework which isn't useful revision into it or don't do it (risky, I got away with it because I'd do more than what it was for my adaption and my teachers knew I revised a lot). So for example the whole class hw you may have some videos to watch on x topic or read x article or write chapter summaries for x book. So how I can use this for the future as a revision resource/active recall was my first thought (for homework which fit into this so like my examples above).
Okay maybe I can make bullet point chapter summaries not just describing the plot (if you know the book well you won't need one and a quick YouTube summary video is available) - so instead I'll do it with the key moments of techniques/change in the text which are structural analysis and things that for most essays whatever the topic, I want to include. Maybe bathos, pathos, particular techniques like anagnorisis etc and then a few bullet points around it with analysis points/triggers. I'd probably do something like that on a document on googledocs, or A3 sheet. Or maybe instead of just watching the video and writing notes, I watch it and then find the key stats and studies I want for this topic of crime (say Sociology) and then make the flashcards already, with those answers. So no I don't have direct notes of the video but I have it on flashcards (online is easier) and I'll be more likely to use the stats/studies in an essay rather than general background info of AO2, real life examples. That sort of stuff meant homework which wasn't revision tasks/exam questions became more useful to me for long-term.