There’s no way students can wrap their heads around advanced topics to the point where language selection matters that much
Of course toy languages like Brainfuck, low level stuff like pure assembly or archaic languages like COBOL would be detrimental to learning. But any mainstream language from the last forty years or so will have major crossovers with most others
I fail to see how D is that extreme compared to most other languages or any reason it should be pedagogically dismissed as a first language