He’s carrying on a tradition for the House leader to endorse and support (with varying levels of “support”) all House incumbents. It’s not an indication of policy agreement or friendship, it’s just if you’re an incumbent, he supports you.

Which is… fine. It’s probably good that the House leader isn’t supporting primary opponents to people in his caucus. But of course some support will be a lot more substantial than others. Pelosi (when she was leader) went to the mat for Henry Cuellar in his previous close primary against a progressive, but would just give perfunctory endorsements to progressive incumbents. When most people know you endorse based simply on incumbency, it’s not really much of an endorsement.