Those quotes are basically saying "every piece of evidence we have suggests that free will is an illusion, but since it is impossible to ever completely rule something out, maybe there is some unknown mechanism by which free will exerts itself that we have not yet found,"<quoted text>
"Also, the predictions were not completely accurate. Maybe free will enters at the last moment, allowing a person to override an unpalatable subconscious decision."
"We can't rule out that there's a free will that kicks in at this late point," said Haynes, who intends to study this phenomenon next. "But I don't think it's plausible."
Maybe this, maybe that.... Maybe we'll just add a few zeros to the end....
Those quotes are just reflective of the average scientist's dislike of making 100% definitive statements about anything. Are you reading the whole quotes, or just the part where they are covering their bases?
And do you know what the word "prediction" is referring to in your first quote? They were able to predict a decision before the subject was conscious of having made said decision.