How does None-Training load matched decay method work? I am doing workouts nearly every day yet right after workout I have certain stats which decay by about 0.5% within a day. Is there a way to actually select No decay? It might make sense if I was training once a week but it makes no sense to drop daily.
TL matched doesn’t freeze your signature.
The setting simply matches your signature to your modeled training load. That always changes slightly day-to day even if you work out daily.
E.g. a lower intensity workout or shorter duration is less TL.
So your signature should float up/down regardless of the decay setting. 
What matters more is the week-to-week trend over the block of training you perform.
Is TP trending up, down, or floating?
You can track that on the XPMC. (Progression tab)
Reference – Signature Decay in Xert: What It Is, Why It Matters, and Which Setting to Use – Knowledgebase
I mean it changes in between workouts constantly, I’d assume it would only change from actual workouts. This is the part I don’t understand. I thought tl matched would only recalculate it after every workout.