No, it isn't.
That's the entire point. If we take your version of events and say standards have changed, comparing Player A from standard 1 to Player B from standard 2 is pointless and stupid. Hence you rate them compared to their peers - how they did in that standard. I don't care if in 2340 every side turns out an XI who make Phil Tufnell look like Viv Richards, if a bowler gets them out twice as cheap as anyone else, he deserves to be lauded as an ATG because he dominated the game when he played it. Then, if you feel like it, you compare their relative merits to their respective eras to give you a very subjective comparison between the two. If you can't compare that way, these entire threads are meaningless and we should consider the last XI a team has put out as the best. Plus we then have to write off anyone who played before an arbitrary development marker as being **** and not worthy of consideration in ATG discussion. Which is very unfair on their achievements. As a side note, if standards have improved I think the development looks like this, given how rubbish the Australian batting is at the moment:
That's an incredibly false analogy, which, ironically, is a fallacy in itself. We're talking across time, not across level. My junior club may well dominate U/12E park cricket by a huge margin; that definitely does not mean they are 'better' than Bangladesh in the way you are suggesting they are.
Which is the crux of my argument as to why your approach doesn't work. Your analysis brushes them aside completely under the guise of 'development'. You know what else brushed aside sociocultural factors to claim superiority? Colonialism. And colonialism sucked for anyone not in that elite few. There's a logical fallacy for you, by the way.
I think ultimately you misunderstand the entire point of this discussion. It is not to find out who has the most skillz and is the best evar at hitting a five-and-a-half ounce chunk of red leather. That is not what greatest means, and that is not how you define greatest. Greatest refers to the impact you had on the game through that action. This notion that Imrul Kayes is technically and skillfully better at hitting a ball than Bradman has nothing whatsoever to do with Bradman's greatness.
His greatness was defined by the way he dominated everything put in front of him by a margin we have never seen before or since.