Again to note, this box doesn't seem to have any default working IR config (even my MCE RC6 remote doesn't work with it OotB), it'll reboot/restart fine, but doesn't shutdown or start (from IR or WeChip G20 RF dongle), no WiFi either but I understand this.
Of course, you're using image tailored to Tanix TX6, which comes with different remote. You have to build your own image tailored for T95 Mini. Check last 3 commits here how to do that: https://github.com/jernejsk/LibreELEC.tv/commits/tx6-mini Those commits were made for similar test - if different IR settings for otherwise box with similar configuration would work.