I think so. We can go to him for confession and Mass. Even if he's not a bishop He is still a priest and the Mass *is* right next door to your house. We do not have to receive communion except once a year and can leave for the sermon. Even if you sit in the back and do your part you will have fulfilled your obligation.
So you are obligated to go to a Mass celebrated by a man who confers doubtful sacraments? He is a real priest, but a doubtful bishop.
He allegedly allows his lay supporters to practice occult rites.
What about his preaching? Is it free from error?
Using this logic, we would be obliged to attend an indult mass, if it is celebrated by a valid priest.
This doesn't sound right to me at all.