I'm guessing it was released now to divert attention away from the Nancy Pelosi hair dresser fiasco, otherwise, they would have saved until closer to election day.
Maybe Pelosi, but she’s not really on the ballot-—or likely worried about angry SFers. My guess is they saw a chance to grab some military votes, distract from good job numbers, improving COVID numbers, and attention from devastating ANTIFA/BLM publicity. One or all.
And, I doubt this is their last smear attempt. To them, everything DjT does requires castration.