https://www.pmgnotes.uk/paper-money-grading/pedigrees/
It appears that PMG will allow you to use your own name, for a fee.
Given I can't easily find any information on this person, it appears that they aren't significant enough to be a notable note collector.
It's also worth noting that if it was from a truly exceptional collection, they would not use the word collection afterwards. As this note does use that phrasing, it again suggests a relative “nobody” in the general collecting field.
So, probably just some vanity for some otherwise unknown collector. Have to admit, having that knowledge does temp my vanity too - if I cared enough about having graded things. 😛