I also was under the impression he was more likely hinting at being mason, I think most of us were; But what I mean by he couldn't have been the other power role, is because the breadcrum post was a little more than a breadcrum when he actually says "Because holy shit I don't think I can say it any different way without hardclaiming".
All that does is make Zaradi at least as viable a NL target as Ragnar; it doesn't confirm, at all or in any way, who has what role unless both are masons; which we now know was not the case.
What Zaradi did was negate the effect of Ragnar's claim, which, whatever it was, Zaradi believed. Objectively I still disagree with what Zaradi did, but my disagreement isn't the issue. The issue is what TOWN Zaradi thinks versus what SCUM Zaradi thinks. I just don't see the world where Zaradi does that as scum, knowing Ragnar is going to flip town.
The rational thing for scum to have done is kill one and roleblock the other.
Zaradi isn't, and can't be the doc, to the extent we have one, because if he WAS a doc then he would have been Doc'cing ragnar as per his activity yesterday, which means there is a role blocker, which means the role blocker blocked Zaradi, which is why Ragnar is dead.
That doesn't mean there isn't a doc, though. There might be, or their might not be; and mafia may or may not have role blocked that person; and even if they did, there's no way to know whether it made a difference because based on what was knowable last DP there were still very good reasons to be lynching Ragnar. That's what every town should have been doing.
And Zaradi knew, though, that Ragnar was the target and he also knew that drawing the NK meant that Ragnar might be able to post his result, which is obviously proving that he doesn't have a power role because if Zaradi was the doc he never would have made the post you identify above. He would have just doc'd Ragnar and there would have been no NK, because, again, Zaradi was never on Ragnar's lynch in the first place.