List.AllTrue Function in Power Query
The List.AllTrue function in Power Query checks whether all values in a list are true. It returns a logical (true/false) value.
Syntax
 List.AllTrue(list as list) as logical 
Example: All values evaluate to true.
Power Query M
let
    Source = List.AllTrue({true, true, 2 > 0})
in
    Source          The output of the above code is true.
Example: One or more values evaluate to false.
Power Query M
let
    Source = List.AllTrue({true, false, 2 < 0})
in
    Source         The output of the above code is false.