It's exactly why it's a perfect test search to see which sites have inaccurate dates.
My personal theory is that blogs and companies set older dates on purpose to appear as a more legitimate source. But I have absolutely no evidence to back that up. I'd like to make results more accurate by adding other sources eventually as part of another one of my same day projects.
Pretty sure Reddit does that for SEO purposes. 5 year old threads (with no recent comments) have started showing up on the google serp even when I’m using a date filter to exclude everything >1 month old. The filter works for most sites, but a few consistently get through.
My personal theory is that blogs and companies set older dates on purpose to appear as a more legitimate source. But I have absolutely no evidence to back that up. I'd like to make results more accurate by adding other sources eventually as part of another one of my same day projects.