Google does consider grammar a factor, yes. But Google also has a thesaurus and can recognize when words are used poorly/out of context. Now with AI its capabilities in that have undoubtedly improved further.

To be honest, we mods “don’t” have those skills. When I recognize the use of article spinners it’s mostly because of the poor use of “not common in that context words”. More often than not those articles don’t read natural due to the words used in them. Then I do a side-by-side comparison and it all becomes clear.