yes Townie
my child is currently in year 7 at Emanuel, and had other options from schools slightly above in the 2019 league tables, such as Ipstock, and was also on WL in more academic schools, who told us they were not anticipating to call on their WL, and a year on we have never heard back.
Bulge year everywhere in London, at least, plus lots of parents disappointed by state schools provisions during lockdown who decided to jump ship to private and I have no reason to think Emanuel had planned on adding a class, they just got caught in the risky game of deciding how many places to offer/popularity and demands, they have had to recruit teachers at a time when there is a serious shortage (especially in STEM, computing), carry out extra building work on a budget stretched by other extensive plans for the sixth form centre and sports facilities.
it's well known that in the previous year, Alleyn's and KCS had under offer and had to go down quite deep into their waiting list, it's a punt.
Anyway, we can only hope things will settle back over the next few years.