This is responding to an undercover video by the activists at Project Veritas. They have released a video that appears to show a Pfizer director saying they are mutating new COVID lines for vaccine purposes.
It actually does show that, albeit he says they're considering/planning on doing it, not doing it right now. The clips where he talks about it are long and with plenty of context, the man in question does indeed have the title Veritas claimed for him (although they are now trying to scrub his internet presence), and when he was confronted with the recordings he freaked out and attacked the reporters. On every thread…
Furthermore, they conduct surreptitious recording of their interviewees, which is illegal in some places they operate (a felony in California). They need to be shut down as a criminal organization.