is it allowed to open this during speedrun?

nope

you can find it out on this site https://docs.google.com/spreadsheets/d/1sbVfoW7LAOdwgXzZH3vcA7D-djr2Y8qAQ_c4WezwhRA/edit?gid=0#gid=0

I looked at this list but I had bxt_show_triggers_legacy so I wondered if this was different. thanks.

I could only see it by doing ctrl+f :) It looks green, I think it will be accepted