No sedes except for the dogmatic type try to "force" their opinion on everyone. What the more moderate sedes object to are the rise of the dogmatic R&R who try to do exactly the same thing. This quote from +Lefebvre simply demonstrates that he was not dogmatic R&R. So it basically has the opposite implications of what you claim.
I’m not sure it admits he was not dogmatic R&R.
I do accept it evinces he was not dogmatic R&R on those few particular occasions.
But whether that doubt/possibility persisted in the mind of Lefebvre as his “real position,” I think is open to question from both sides:
R&R can say, “Yes, he said those things on a couple occasions, but look what he said/did against sedes in between and after those quotes.”
Sedevacantists can say, “No, the long time between pro-sede utterances evinces he held that position throughout the years, and his anti-sede actions were merely on the practical order for the sake of unity ad infra.”
Unfortunately, Lefebvre is dead, and consequently, given the lack of resources of him discussing the issue, the matter is open to conjecture.
Its because of that leeway that I am less dogmatic in the last couple years regarding what Lefebvre’s true position was, than I am regarding sedevacantism generally (which is based mostly on other difficulties associated with that position generally, but that’s another can of worms).