Agreed. I looked too. Unless i'm given a URL I believe that AAP page is a fake.
I think it's real but hugely misleading.
http://www.scaap.org/wp-content/uploads/2019/01/Foxworth-CATCH-Update-and-Highlights.pdf
Pfizer doesn't fund AAP as such, but they do help fund the AAP Community Access To Child Health (CATCH) program, which is a tightly focused program of grants for specific innovation initiatives in Paediatric Community Health, where those initiatives could not be funded in other ways.
There's no indication of any conflict of interest; Pfizer doesn't appear to fund the AAP, other than in the provision of CATCH grant money. The pdf at my link (above) lists the specific exclusions from eligibility for CATCH funding, and it's very clear that this funding doesn't support the AAP itself, its administration, or its members and their activities, other than innovations in community child health specifically defined.
That pdf makes clear that Pfizer is the major donor to the CATCH program. That's not the same thing as being the AAP's "biggest donor" as alleged by the meme.
But to a conspiracy theorist, everything looks like a conspiracy.