That's not relevant.
I'm old enough and have been eating this food long enough that if there were health implications, they would have surfaced already.
This is of course another tactic of pseudo-science con artists where they shift the goalposts whenever challenged so that it's functionally impossible to challenge their assertions.
Show us the peer-reviewed and accredited medical studies which demonstrate that a blood type diet provides any benefit whatsoever over a standard diet.
Anything at all, we're not that fussy. The only requirement is that the study has been published and peer-reviewed in a respected scientific journal.