[Coleus]

A traditionalist chapel around here made by fine for years with a retired priest from the diocese coming to say Mass every day.>>>

If the church is under the auspices of the bishop then it's ok. I know of one where the mass (novus ordo) is celebrated in Latin, the women wear veils and they kneel down for communion but it's ok because the order of priests have permission from the local Ordinary, the bishop; therefore, it comes under the auspices of the Catholic Church. The bishop gave permission for the church to be used for this purpose and gave permission for the priests to celebrate this type of mass.

[Hermann the Cherusker]

Nope. There was no "Church". A group of men hoping to make a monastic foundation set up a chapel and living quarters. Others decided to come and assist them out of devotion with aid in building the facilities and joining them privately in worship. There was no faux Parish or anything else.

The Bishop of course became opposed because the men wanted to keep the Latin Mass. But the Bishop can't stop people from inviting priests to come and say Mass at their home, nor can he stop people from attending privately.