That sounds correct to me. A physicist who also possesses probability-theory expertise and who can reason with respect to Solomonoff Induction and formal causal models should realize that single-world variants of MWI are uniformly unworkable (short of this world being a runtime-limited computer simulation); but such is rare (though not unheard-of) among professional physicists; and among the others, you can hardly blame them for trying to keep an open mind.