It's this really YIMBY or actually YIYBY ? It's difficult to tell checking the whole website.
Edit to be more explicit: are the people that sent/asked to send the 2 letters to the City Council residents of Rancho Palos Verdes?
Barring eminent domain, YIYBY is impossible. It's always YIMBY.
I don't know, does new housing or municipal services get built in anyone's literal backyard? So it's not Your or My Backyard, really.
NIMBYism has always been about nosy people obstructing progress.
Definitely YIYBY.
If you're going to invent the term YIYBY are you willing to acknowledge far more NIYBY than NIMBY behavior?