True, PAL is 25 fps. The restored A11 TV feed is sourced from NTSC videotape held in CBS and the VHS of Sydney video (also video sourced). The 24 is from said genius' counting. Given GOP and all the other inherent MPEG2 encoding paramaters, using that transport stream as a robust method to calculate analgue video framerates isn't exactly the smartest thing to do, especially in the presence of people who actually use such files professionally. It is similar to claiming jpeg artifacts constitute alien structures on the moon. These days it is possible to encode in 24p, but the PAL DVDs are stock standard 576i encoded. I bet our mate doesn't even know the said DVDs were converted using Atlantis DV film which clearly states on it's website that "NTSC to PAL works by first converting the NTSC to film motion (24P), same as with DVFilm Maker, then speeding that up slightly to 25P." And there, my friends, is where the 24 frames come from.
The whipper-snapper seems to have adopted the tried and true "If I can't baffle them with brains, I'll baffle them with b.s." motto. His video analysis of Apollo TV lacks any sort of proper research, nor any great understanding of TV technology in general - as usual.