You're right, and this is a sticky point - if we (as investigators) think the witness is is wrong about the date being 28 May 2024, how can we accept their word with the month & year but not the day? This is a common accusation put to investigators - cherry-picking evidence to suit a pre-defined prosaic conclusion. In this case getting the day wrong is a 'small' error, not a 'gross' error like month or year. All we can do, like in science, is declare an assumption and make a tentative conclusion based on that assumption pending confirmation of the date & location from the video metadata from the witness/podcast host.