What makes it truly Facebook boomer slop isn't that the story is implausible (because such a misunderstanding and then correction is perfectly likely) but the lack of sources, the anecdotal and vague nature of the post, and the slightly misguided message of "motherly experience will always beat studies and expertise" which is only pandering to the mothers who read this stuff.

If this actually happened, give that woman a name and tell us who she was, don't just call her "a mother".