What does this mean regarding iq4 updates

What does this mean? “This is the last planned firmware release for IQ Hub and therefore should be considered as a mandatory update.”

does this mean that firmware won’t be updated in the future for the IQ4?

That firmware thread and that comment about the latest version is only relevant to the original IQ Hub.

It is not relevant to the IQ Panel 4 or the IQ4 Hub. No final firmware has been announced for those.