Oryx has confirmed a total of 78 Russian combat aircraft destroyed (and 70 Ukrainian). Those Ukrainian tweets are pure propaganda and should be taken with a mighty grain of salt.
I wonder perhaps if the bomb was guided by GLONASS, which the Russians would be more reluctant to jam. Or it could have simply homed in on the interference transmitter.
I don’t think anything uses just GPS. Modern electronics that do location services typically use all three major satellite systems, and WiFi, and cell towers, and magnetometers, and integrated accelerometers, and anything else they can think of. I’d expect a guided munition would have technology at least as good as what’s in a phone.
I think the UK Defence Ministry at one point (a few months ago) said that they thought the Ukrainian estimates were broadly accurate. However you may or may not wish to also believe the UK’s claims in this matter.