Yes, but haven't they already had success in removing the "particle" via microfiltration? Isn't that how they've determined its size.
It may depend on what is meant by "remove". Best as I understand/recall it, they filtered the serum so that it was divided into two sections: serum with small stuff, and serum with big stuff. The particle in question was in the "big stuff" section, but with other big stuff.
They may have done other things since the last video I was able to watch.
This sounds like more tests that you know of.They've conducted many gradual filtrations by size and retested the "blood" on cells in the nanoneedle and/or in the salt-work test?
But still might not isolate the exact particle? Else they might have been able to identify it or at least say what kind of particle it was.