Highly unlikely - PCa just doesn't move that quickly. The biopsy is like sticking a pin in a fruit cake & hoping to spear a cherry - they found a cherry and thought they were dealing with it - it turned out there were other cherries they missed.
If you are going to dwell, it might be helpful to know that 8 weeks from MRI to surgery is actually remarkably quick - many men here have had to wait a lot longer than that for their op (and that was before COVID) without any major changes in between times. It takes time to get the mRI results, arrange biopsies, get biopsy results, discuss at MDT, discuss with patient, wait for patient to see oncologist and / or second opinion surgeon, wait for patient to notify of choice made & then arrange the op. Your man was quite fortunate that all was done in 8 weeks - in that context, I can't see that there was any Covid delay at all in your case?