That #Tails "use the WoT" download #verification guide is telling you to do 2 distinct things:
1) use #PGP WoT metrics to identify someone who is a Tails developer (but not AFAICT to identify that person *as* a Tails developer);
2) make a WoT-less leap from "this is Bob" to "Bob is verified as a Tails developer AND his signatures mean something".

In that "→A→B→C" chain of mixed ops, #WoT only takes you to B.