Sentence B is not grammatical.
Student or Learner
A. He blames me without any reasons, which means that he hates me.
B. What he blames me without any reasons means that he hates me.
Is it able to Replace "A" sentence with "B" sentence?
Whether "B" sentence is good or not.
Would sentence B be grammatical if 'What' was replaced with 'The fact that'?
The fact that he's blaming you for something does not mean that he hates you.
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Please note that a better title would have been He blames me without any reasons.
Extract from the Posting Guidelines:
'Thread titles should include all or part of the word/phrase being discussed.'