Apparently "anonymous" sources are fine with Trump when he uses them or they are favorable to him. In fact, he has reportedly used fake names to be his own "anonymous" source.
Donald Trump's Long, Strange History of Using Fake Names - Fortune
Donald Trump masqueraded as publicist to brag about himself - The Washington Post
Social media users criticize Trump on anonymous sources
Trump hates anonymous sources, unless they're in stories favorable to him
Donald Trump hates anonymous sources. But he cited them to falsely claim Obama was born in Kenya
Trump’s Love-Hate Relationship With Anonymous Sourcing
6 Times Donald Trump Relied On Unnamed "Sources"
Donald Trump's Long, Strange History of Using Fake Names - Fortune
Donald Trump masqueraded as publicist to brag about himself - The Washington Post
Social media users criticize Trump on anonymous sources
Trump hates anonymous sources, unless they're in stories favorable to him
Donald Trump hates anonymous sources. But he cited them to falsely claim Obama was born in Kenya
Trump’s Love-Hate Relationship With Anonymous Sourcing
6 Times Donald Trump Relied On Unnamed "Sources"