The point, which is not obvious to you, but I will clarify it to those of good will, is the remnant is far more likely in Lefebvre Sacraments than in Thuc line Sacraments.
"More likely" means "not certainly" or "probable" and still means there is doubt involved.
Or....how about the "remnant" (whatever that means) is located in ALL Trad groups (i.e. sspx, resistance, Thuc, sspv, etc).
We have a crisis in the Church, we have people trying to survive in lifeboats in the middle of the ocean, and you're the idiot who is trying to sink lifeboats while declaring that ONLY YOUR LIFEBOAT is the most sea-worthy. That's foolhardy and uncharitable.
Stay in your lane, support the Resistance and stop attacking other Trad groups.
The doubt, over Thuc is not a statement of invalidity, it is simply a doubt. The Lefebvre line is far more certain
"Far more certain" = doubt still exists. You've just admitted there is still doubt. Stop acting like you know everything and stop attacking other Trad groups.