>>>Rabbi Krohn said that there was no golem as there was no mention of the golem in any writings until many years after the maharal was niftar.
That doesn’t prove anything. According to all versions of the Golem story it was a strictly kept secret at the time it existed. From the few people who did know about it was the SIL of the Maharal who helped make it. The way the story allegedly became known to the public was after it was found in that SIL’s private writings about a hundred years after his death. Therefore the question of “why wasn’t it mentioned/known?” doesn’t really prove anything