It certainly is. Just the other day, non-Catholics were saying that Catholic caucus threads were for those who weren't able or didn't want to defend their beliefs. Now they're complaining because their own caucus designation, having broken the rules, has been removed.
The way the rule is being interpreted all Protestant caucus threads "break the rules" by definition. Many of not most of the Protestant distinctives are antithetical to Catholic dogma, thus the term "PROTESTant". Thus, by the definition being thrown around here any statement of Protestant doctrine violates caucus rules. Which in practice means Protestant caucus threads will be hounded and tossed out. It's just a matter of when the torches and pitchforks show up.