I know it is still a beta release but I have just installed the 2023.9.0b1 and tried to add a new LibreTiny device and there is no option ??
It was available in the last version of the separate LibreTiny Esphome.
May be better asking on the ESPHome Discord - the developers are more likely to see your question there.
I have just tried to to compile a .u2f file for a new device in the beta and it works fine so it is just the LibreTiny entry in the new device dialogue that is missing.
I can’t access my Discord account for some reason so I’ll leave it till the official release lands.
Looks like this is the intended behavior for now (no LibreTiny wizard option) 
https://discord.com/channels/429907082951524364/866427615564922920/1152029898295214081
