I am wracking my brain to figure why this pipsqueak should think so much of himself he had to go underground after two decades of being photographed with Fanny, and, I would wager, acknowledged in said photographs as a co-owner of Lalande. So his face is on the record for the tax man, should he ever take an interest.
All we know is that, according to Clara, Isabelle and Stephanie were so appalled when Nic Larkin decided he was to marry Marie, that they spent an entire dinner conversation obsessing that she would wish to re-decorate the shitoo, as the wife of a co-owner. Second, that Larkin said at some point the alliance with Pheeph was most unfortunate.
When he went under the bag, I'd wager he was already married to a well-employed wife whose bosses might frown upon this louche connection.
So. Already known to tax man, wife impervious to any louche connection, Larkin covers his own face.
The only reason I can think of is he knows something about Jarvis' life and practice, what and how she would film, with which he does not wish to be visually associated. Very strange.