This issue seems to persist, right? I've just updated my old Wetek Play 2 with LibreElec 11.0.3 (thank you for that!). But after installation of three or four addons, no further addons can be installed.
What is your bantime for this rate limit? Seems to be more than one hour 
My current public IP is x.x.56.32.
Code
curl -I https://addons.libreelec.tv/
HTTP/2 429
alt-svc: h3=":443"; ma=2592000
retry-after: 0
server: Caddy
date: Wed, 09 Aug 2023 09:57:12 GMT