Thanks for the confirmation and inside info!

Yesterday we only guessed it https://news.ycombinator.com/item?id=16069740 based on ARM CPU list,

the RPi 1-3 CPUs

  ARM11, Cortex-A7, Cortex-A53

aren't in the list.

Affected ARM cores:

  Cortex-R7, Cortex-R8, Cortex-A8, Cortex-A9, Cortex A15, 
  Cortex-A17, Cortex-A57, Cortex-A72, Cortex-A73, Cortex-A75

https://developer.arm.com/support/security-update

(I tried to post it 3 hours ago, but HN is rate-limiting my posts, oh well)