I think the problem with articles like that is they seem quite oblivious to people's actual complaints when they say their attention span is getting worse. If you spent 2 hours a day reading books 10 years ago and now you spend 2 hours a day doomscrolling then could make the case your 'average' attention span hasn't changed, but when people lament this change it's much more about the lack of any intentionality in doomscrolling for two hours vs reading for two hours. There's also a subtext of 'if we can't measure it it's not real', which you could apply to any mental health issue.
I don’t know — while I do often fall victim to doomscrolling/commenting/etc, what the article claims is true: I can equally well get sucked into some random niche topic I am enthusiastic about for hours on end. So my attention span is indeed not changed from when I read a book with multi-hundred pages in a sitting in my teenage years, it’s just that my motivation/interests are not the same anymore.
And thus I have to disagree with you here - there is an issue that many people experience but to combat it we have to actually know the reason behind. Attributing it to something that may not even exist is harmful.
