Yes, we are all neurodiverse. That's the bloody point. Neurodiversity is about all the different types of brains and ways they can work.
We are not all neurodivergent, unless you want to utterly redefine the meaning of "neurodivergent". In which case, you'd be taking away a useful and unique term that's important to a disadvantaged group of people who have found a great deal of utility in it, and turning it towards… what useful end?
I'm not even that bloody fond of the neurodiversity paradigm, FFS. But I at least have the empathy to see that it's emotionally and politically important to others, and has even facilitated progress in some areas. Why would you want to dilute it to utter uselessness?
If what you actually want is to identify those who "need the help" (however you're defining help — many people would benefit from even fairly small adjustments and accommodations, which may not even require extra effort or money), and you're defining "those who need the help" as those who cannot ever conceivably pass for normal, then what do you propose doing with people who are currently diagnosed with one of the ND conditions but who don't pass the ssd sniff test?
I mean, we've seen what happens when these conditions haven't been formulated, or go undiagnosed. The prisons are full of us, the unemployment books are full of us, the mental health services are full of us, we fall short of our potential, we die in accidents and kill ourselves from despair, we disrupt your children's classes, we have road accidents, we cause confusion and resentment in others, we attract assaults and other attacks, it's all a bit of a mess, right? We've tried that, so maybe we can try the approach where we recognise that for certain individuals identified by qualified professionals, what you may be fooled by as a limited performance of "normality" is actually a high-effort and often counterproductive veneer over specific sets of difficulties.
(I know some people with ND conditions can have happy, successful lives without identification/recognition/diagnosis, or any kind of overt or official "help" or adjustments, but many don't.)
Are you advocating reserving help only for those who are manifestly unacceptably abnormal, and everyone else who would currently receive a diagnosis under the ND umbrella being told, well, everybody's neurodiverse, so everybody's neurodivergent, and everybody struggles and masks, so suck it up buttercup, you're no different to anybody else? Because I can't work out what else your post might mean.
Or do you just want to sneer at people that they're not as special as they think they are, and get away with it because after all you're only discussing philosophical aspects of semantics and taxonomy within a field that's a matter of public interest, or some equally specious tripe?