My guess is that the increase in number of posts related to ADHD could also be attributed to a form of astroturfing by YC Companies (Inflow - one that I had seen being recommended a few weeks back).
That sounds plausible as well and I don't think both theories are mutually exclusive. The Get Inflow LTD was incorporated in May 2020 which loosely fits the above COVID-induced mental health crisis narrative. A worldwide event like that has an impact across various fields. Just like we've seen a general uptick in video-streaming and remote working tech companies since then.
