As much as I like talking a big game. In New York, Jews, in a city owned and run by Jews, assembled for a public funeral of a Rabbi against orders. They set the cops on them and the firemen came and put the firehoses on them, breaking up the funeral march. Those were Jews. How do you think the same authorities who hate Christians would treat the local SSPX that doesn't even have the support of the local diocese? Would they take the fire hoses into the Church and turn them on the priest and faithful, drowning the Blessed Sacrament? They threatened to close down permanently and seize the property of Churches who tried to hold services here.
In such a state I prefer them to lay low. Hear confessions by appointment, give the Eucharist to people privately one or two at a time, hopefully hold private Masses that are not open to the public, with trusted non-snitches can be invited to them, and if it is possible to hold regular Masses, go ahead. And to sue and try to legally win the right to hold Masses by their rules, sounds great? And I do not see how we can say Masses should go on because the Church is above the state, when the Church herself and the Bishops ordered the Churches to be closed. At least the SSPX is holding public Masses against the wishes of the local Bishops when the local state authorities is allowing them.