I think the expression is "truth be told", not the bastardized "if the truth be told". The irrealis is inherent in the old verb form; "if" is redundant with it. It is not passive, it is the way the subjunctive was used.
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Grammar Geek"Truth be told" I had not realized that "if the truth be told" was a bastardization. I'm afraid the current is against the idea of keeping the original form. Kind of like how "it begs the question" is just about never used the way it's supposed to be.I wouldn't classify it as a "bastardization" either.
AlpheccaStarsAlmost nobody uses it "correctly" anymore.It often confuses me, so just to be sure I have it right --