Ah, it’s a felony if you withhold exculpatory information from the defendant in a criminal case. However, this is referring to withholding exculpatory information from the FISA application, which apparently, might just be an administrative booboo that requires some remedial training instead.
No it's not. It is a Brady or Giglio violation. Those are judge imposed rules, failure of which is not a felony. Worst case in failing these is case dismissed, but the usual outcome is "no harm, no foul."