It's not entirely clear what ">3" means, but if you assume that the tiers are 0-based (0, 1, 2, 3 and 4), then it would mean that only tier 5 can drop them. Or, it could mean that it can drop from tier 4 and tier 5.
Also, the drop rates of sunders were apparently not changed. The difference is that in the past, all champions and unique mobs in TZ were eligible to drop one (as long as the TZ level was high enough anyway), but now it's only Heralds, and only the higher (highest?) tier, meaning they're now extremely rare compared to before. ~1/238 on p1 according to Nishi who has looked in the game files.
EDIT: MrLlamaSc has said on stream that herald drop rates will be tweaked (and I'm sure plenty other things will be tweaked too, just wanted to mention that as well).
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That is some valuable piece of information, thank you bringing it over here to the forum, ShadowHeart.
I wonder if the "Herald Tier" integer keeps increasing as they spawn in the same game? Probably yes. This would mean (assuming 0 is the first value) that "tier>3" matches all subsequent Heralds of Terror as well -- integers 4 (5th Herald spawned, first "of Terror"), 5, 6, 7 etc...
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ShadowHeart
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