I think you are mixing the citi app "rule of thumb" for non AA cards with app "rule of thumb". The citi "rule" is that citi allows apps every 90 days, but best to wait for 95 ish as Citi is reportedly known for not counting exactly 90 days, i.e. sometimes it's 91 or 92 and if you apply to early, it's a denial.

I've read the 90 day app "rule" a bunch, but I'm not willing and have no need to be that aggressive. It seems to me that waiting another week, ie. to 95 days so that you encompass both "rules" is simply not that difficult.