I think it might be - people who have normal energy/concentration levels get long COVID brain fog and then start wondering if it's a focus issue. I got dx'd with attention deficit issues a few years back but it really got bad after I got COVID. I definitely want to get back on a stimulant so I can function better but I'm making do with Wellbutrin b/c by the time I went to the doctor the shortage had already happened and it helps with my mild depression anyways.