CM understands that a True Pope can Revolve into an anti-pope for reasons other than having procured a fraudulent election. One reason is committing blasphemy.
How does this blasphemous display not render Boniface VIII(8) an anti-pope? If someone in a Judaic temple displayed a Cross, it would certainly be considered blasphemous by them.
Keeping in mind that St Pius X declared Boniface 6 and 7 to be anti-popes, I think there is one remaining. It seems as if 3 at once was to much for the Pope.