I am disgusted by your lack of integrity here.

Jonah made an unconditional statement in the name of the Lord. It was only revealed as conditional because it didn't come to pass.

Therefore, not everything spoken by a true prophet must come to pass.

I'm not disagreeing with scripture at all. You are trying to simplify scripture by taking bits of it out of context. Obviously both are true, but nowhere does it specify "100%".

One could assume that 100% is meant... Until encountering Jonah's case. Then obviously you must reinterpret to take all of scripture into account. It's a little more nuanced than you want to make it.

Can you follow that logic?