As Reality Steve pointed out, a big part of the whole Bachelor / Bachelorette journey is the lead getting to know everyone for the first time, as well as the cast interacting for the first time on camera.
Because they were due to begin filming on Friday, they now all know each other and have already had many of those interactions without fans being a part of it.
So, Clare and the fans might actually get more men closer to her age on the show now that the delay is shifting everyone’s plans, but there’s another factor at play that Chris Harrison didn’t mention when talking about casting new guys.