Exclusives are often exempt from "rules" pertaining to the main lines.
Do you have a link to what Hasbro were referring to, as I think the "expense" element may have been referring to the Hasbro mainline sizes shrinking in size around 2011-2012, making it less likely to reproduce one from before the last movie.
But, Takara Beast Era figures were of varying sizes because they didn't have size classes, and each figure had different prices. If one is similar size to the current Deluxe class, it could be within their budget to do it if they wanted to. Some of the HK Generations were pre-2011 moulds, and were released in America as exclusives... and this set of "Then & Now" sound like exclusives.
But it's all moot really, as the $25 pricing of these smaller sets at TRU means it is a smaller-than-Deluxe figure (if a single figure). And if it is a 2-pack, it would have to be similar to a GEN Legends 2-pack.