I'm guessing the agreement with Epstein would've been worded along the lines of '... in full and final settlement of this and any future claims against Epstein and/or any other person, arising from or relating to the facts alleged by Guiffre in these proceedings.' It'd then be a matter for the court to decide whether that wording encompasses the subject matter of the current claim. The Sweatless One might be able to avail himself of it without admitting anything, on purely procedural grounds. The 'optics' would be awful, but, to be honest, they already are; from his perspective, at least it'd protect him financially, not open him up to US criminal proceedings, and allow him to avoid some pretty uncomfortable questioning. If it fails, he can still argue a jurisdiction point. After that, he'll have little choice but to ignore proceedings and allow judgement in default, and fight any attempt at enforcement in the UK.