You are technically correct. The sentence really does not need either comma. But, since this is a speech balloon, maybe the writer intended for us to “hear” her pause there to emphasize the word “recently”.
Sir Charles, we all seem to agree, is a fine artist. But his Tracy is looking less and less like classic Tracy. (I know, I know. I was spoiled by the artist doing the last MM, who really excelled at giving the strip a classic Gouldian look.)
Today’s strip is full of stuff that the writer assumes the readers will understand, or perhaps he doesn’t care if the readers do understand, which would be a bad attitude for a writer to have.
“Buffalo Gal”