No I think it's quite fair to view the PPC platform as anti-vaxx - the PPC has openly rejected provincial mask mandates and embraced disinformation. Bernier himself has avoided making any direct statements but he has surrounded himself with virulent anti-vaxxers.
The PPC is essentially the party of Bernier right now - no PPC MP has ever been elected (though they did take home 5% of the popular vote this election). As such the personal actions of Bernier is really all we've got to go on - so I don't believe it's particularly irrelevant, though I won't dispute that it is quite vague and not at all definitive.
Are you sure you're not conflating anti-vaccine-passport with anti-vaccine?