It does say silence on positive things. Read the
opening section. Of
course if you do read it you will put yourself in an extreme minority
but that is something you may have to accept.
The page, WP:BLP, says silence on positive things. WP:BLP is not
policy, it's an imperfect description of policy. When was the last
time you saw someone remove positive material from an article citing
BLP? The page talks about "contentious material", how that is
interpreted, however (and it's the interpretation that is the policy,
not the words) is as "negative material".