Actually it is green when the expression is above 0.80. If it is below 0.80, the expression will show 0.80. May be change the order of Green and Red around?
=If(
(
IF(Count({<[T1 >= 7days (Start Work ~ OnWatch)]={'0'},[Type 1 Count]={'1'}>}Ticket)>0,
Count({<[T1 >= 7days (Start Work ~ OnWatch)]={'0'},[Type 1 Count]={'1'}>}Ticket))