I believe everything is ok in moderation, including screens.
When DS was born I had serious PFB syndrome and we did not allow screens at all.
He hit his motor milestones but did not hit his speech and language milestones and he did not play with toys either. He was destructive. He liked to pull things apart to see how they worked but did not have the skills to put them back together.
He also did not, and to this day almost 7 years later, sleep through the night.
He got his autism diagnosis aged 3.
When SALT got involved it was all "talk more, red books, narrate what you're doing, narrate what he's doing" and it felt like I'd run out of words to use by the end of the day. I was talking so much I was losing my voice and my mind.
I posted on reddit and some people recommended things like yakka dee, twirlywoos etc that model functional language, and it gave me a much needed break and lo and behold he started picking up language too. He will always have a lifelong speech delay, but screens gave him the language he needed by providing functional phrases that he understood and engaged with, gestalts, echolalia that we could build on for helping him meet his needs.
He also struggled with patience and waiting his turn, made no progress in school with the various therapies and interactions listed in his EHCP, but after introducing video games where he can try and fail and try again on his own timetable when he is ready to engage rather than on an adult led schedule has worked wonders for him and his ability to wait. It's the difference between waiting in a queue with some mild agitation and just not leaving the house at all for us and living a completely isolated life.
I also have a family member with a very young child who has been given screens since the second he entered this world and he has unmoderated access, is behind on his speech milestones, and now this family member is pushing for an autism diagnosis on the basis he isn't talking, when the content he watches is pure brain rot, not educational, and he doesn't get talked to, he gets talked around. I'm not discounting it's a possibility but it feels very neglectful to me that the work has not been put in to see if a change of environmental factors would make a difference for him in terms of his development, and he is categorically an iPad kid. I try not to be judgemental about it, but even talking to this child myself results in tears because it's an interruption of his screen time.