As a point of clarification, "Past Month" is not the same thing as "Last Month" or "Previous Month". "Past Month" in this context actually means the past 30 days from today. It's a really subtle and confusing nuance in English. In any case, Google Search having results from 5 days ago is accurate when filtering for Past Month. Google (being a global resource) really should reword "Past Month" to "Past 30 Days" to eliminate any confusion.
But still, none of the reddit posts he referenced are from the past month. They say things like Jan 11, 2020; which would be correct, but the actual post on Reddit is 6 years ago.
Whether this is Google or Reddit causing this is another issue.
