A bridging tap acts as a tuned stub and will absorb energy at its fundamental and harmonic frequencies. So if it has always been there, it would have been degrading the service from the day the service was first deployed and nobody would have known any better.
If you and your neighbour share a service feed, from the D-side cable, before splitting into individual lead-in cables then, yes, there is a possibility that having upgraded their service from ADSL2(+) to VDSL2, there is more cross-talk originating from their VDSL2 service.