> The post claims they were fuzzing their Zig code, while during our calls the whole Bun team told us that they were not fuzzing anything

If you read the post again this sentence is not removed and Sumner did not refute that

Right, that part is not in dispute.

If Sumner says today, "We do X," then Kelley can say, "Nine months ago, Sumner did not do X," and both can be correct. What Kelley can't do is say, "It's an outright fabrication that Sumner does X today," based on an observation from nine months ago.