This is no way disregards the difficulty of living with an actually severe case of ADHD but is not what most of these people are dealing with.
EDIT: many seem to have misunderstood what I mean by this. I'm not saying these people are only claiming to have ADHD to use it as an excuse. What I mean, is that they may very well do have, and they're using it as an excuse. Mostly to themselves.
I don't think you have a strong understanding of ADHD.
I do think you're looking at the outsized influence of a very tiny subset young influencers that are making ADHD content.
Even if it were the case that people are using the "excuse" to be lazy, what do you think that has to do with the "you must constantly produce to be a contributing member of society" outlook on labor in latestage capitalism. Or how this could be the youth's response to feeling undervalued and under compensated for their labor.