"he thinks the Breen suits can be penetrated and that witnesses have done so (to their detriment)"
Any technology can, in theory, be defeated.
And urban legends are bound to appear around uncracked technological riddles - especially among specialists.
BTW, what I consistently said is that what was said/shown about the breen can be reconciled - with a relatively non-convoluted explanation.
Which does not change the fact that the writers obviously changed their minds as to how to portray the breen during DS9.