That page seems to be saying the opposite: hardware attestation would support GrapheneOS, whereas the Play Integrity API would not.
Anecdotally, both of the banking apps I use 'just work', and I haven't encountered any app that doesn't work. The closest thing was the Disney parks app a few years ago which would crash on launch until I disabled the hardened malloc feature for it.
That page seems to be saying the opposite: hardware attestation would support GrapheneOS, whereas the Play Integrity API would not.
Anecdotally, both of the banking apps I use 'just work', and I haven't encountered any app that doesn't work. The closest thing was the Disney parks app a few years ago which would crash on launch until I disabled the hardened malloc feature for it.