He's not talking about fonts though. When Brennan says "this program", he is referring to IN, not to any of his own font projects.
Furthermore, the "the MFEK AGPL Flood Exception" he is referring to, I looked it up and he's apparently referring to this which he appears to have written on his own, which does not appear to pertain exclusively to font developers but to any program released under and covered by the AGPL, which would include IN since that was also released under AGPL:
Again, why is Brennan - who has supposedly long abandoned IN and only wants to take down Null - why is he all of a sudden seeking an exception to the AGPL for IN, insisting that IN adopt that exception? And why is he making it openly known to Null, as if to grab his attention?