"Cold fusion "didn't work" because they announced too early"
You are right for all the wrong reasons: cold fusion was demonstrated in 2005 using the pyroelectric effect to accelerate deuterium atoms into a deuterium target (see: https://en.wikipedia.org/wiki/Pyroelectric_fusion). Unfortunately, this concept doesn't seem suited to generate meaningful amounts of fusion energy.
As for the rest of the cold fusion claims, they seem to have moved from the scientific fraud stage (delusional chemists having trouble with nuclear physics measurements) to the financial fraud stage (delusional chemists collecting M$ to build cold fusion power plants). Come back when one of those demonstrator power plants produces any meaningful quantity of power. Until then, I'll continue to laugh at your cold fusion.
Biting the hand that feeds IT
