Edit - Apologies, I was meant to quote the post from thedutchessofspork questioning someone else's list of Eva, Olivia, Ava, Isla and Isabella.
Obviously I can't answer for other poster about whether they're recent births but I really don't understand what's surprising about that particular list? Especially considering there are many lists of 5 on here containing far less 'usual' choices. I don't understand why this one in particular is being questioned as to how recent it is?
Whilst they may all be dropping in terms of actually numbers (as are all 'popular' names, as the pool of names people choose from gets wider and wider each year), Olivia, Ava and Isla are still clearly going to be top 10 when the 2022 and subsequent 2023 ONS data is officially released (probablyeven top 5 still), and Isabella probably top 20 and Eva top 30-40. All 5 are still very much in use (Olivia was still number one when the last set on official data was released in 2021!).
Just because names like Luna, Maeve, Margot, Mila, Penelope etc may be rapidly rising, doesn't mean the old favourites aren't still reigning supreme. I would not be at all surprised to hear that the last 5 baby girls somebody knows of are called Olivia, Ava, Isla, Isabella and Eva. It's hardly like OP listed 80s classics like Stacey, Michelle, Leanne, Claire and Stephanie (for example). I could understand why that might raise some eyebrows!
For what it's worth, I still hear Olivia and Isla all the time around me. They don't seem to be losing favour in my area at all.