I think there is a misunderstanding of how his blabbing is hurting his future defences.
It is not about admitting or not admitting to crimes. When you say that he did not admit to being guilty it sounds like you expect him to say “yes I SBF have done wire fraud using interstate communications”. He certainly did not do that. That is not what anyone says when they say he is admitting crimes.
The way criminal law works is that the crimes have elements. To be able to say that you have commited X a prosecutor has to show A and B and (C or D). What he is doing is not admitting X, but providing the As, or Bs or Cs on a silver platter for a prosecutor.
For example maybe for some crime they have to show that when you made a statement you did know that it is false. That is really hard to show. Unless you help them out by going on the record about what did you know and when. (Which many of his statements seems to be doing.) That is one element I have heard about, but there are many different crimes he can be in trouble for and many different elements. Also the interpretation of many of these elements is arcane to say the least. You really need to be an expert on law to be able to tell what the terms means. Which means that it is very easy for him to fall into a trap where he is saying something which to my untrained ears sounds fine, perhaps even exculpatory, but for a lawyer’s ears provides the last element to prove something.
The other way his blabbing is hurting him is that it locks him into a specific story. Years from now, when prosecutors get a case together they will have to share all their evidence with his legal team. Then his legal team would have the option to find the most defensible, legally best narrative for all of it. But they can’t do that if he already locked himself into some narative. Every time he opens his mouth he is removing freedom to maneuver from his future defense team.
The third way he is hurting his case is that if there is anything he says which later turns out to be false, or can be depicted as false, that can be used to paint him as a liar. And that can be used to undermine other things he might say. This might not be a crime in itself, but can be used to convince perhaps a jury to disregard his statements.