As debated on the topic you linked, the reasons for which Wifi-calling and VoLTE are not available on the FP2 are partially unclear. It may be due to some firmware lacking, to some software lacking (but this seems rather improbable to my understanding), or even because the chip just doesn’t support it. An update to another major android version could only change the software part (which I repeat, seems rather improbable), since hardware doesn’t change and firmware isn’t updated since the last update of A6 on the FP2. I have seen nothing hinting any change in this, neither have I heard of a FP2 on which VoWifi or VoLTE worked.
So the answer, I fear, is no…
First, VoWiFi is not listed in this list, which you asserted in your post:
So no, there isn’t hardware support for VoWiFi on the FP2. If it has been proven to work on some specific Samsung devices with the same processor, it may be due to some custom chip or arrangement from Samsung which FP probably didn’t have.
Second, VoLTE is listed indeed in the specs sheet of the CPU, but this doesn’t mean it has hardware support on the FP2. Device manufacturers negotiate with Qualcomm to have all features, and they may not have negotiated to support VoLTE. Then, even if there is hardware support for VoLTE, you also need firmware support, which might very probably not be the case for the FP2.
Sorry, i thought we were talking about volte.
Then its pretty clear why vowifi isnt supported. The case of Samsung is indeed very weird. I doubt that VOLTE isnt supported, because it would be very weird to remove that part.