I think we kinda need better context to be more sane (as in, I'd like to see the panel/text where the quote comes from), but gold-plating and gold-plated I've seen used mainly as pejorative terms when applied to anything that's not supposed to be gold plated. Like a commando. Gold plating such an object would be an addition/augmentation that has pretty much nothing to do with what that object is for, but that would increase cost noticeably and therefore be kind of absurd (or wasteful, depending on your perspective).
Here's where context kicks in, and can lead me in a few directions:
If there are actual gold plated commandos (or say, commandos with an excess of guns to the point of absurdity, being led by a five-headed goldfish) being hunted and it's a bit unexpected?
I'd be surprised if either one of them [Whale/Browning] could dream up something quite as strange as this.
Alternatively, if they're on a march and just talking, comparing their real-life jobs to a monster movie
The founding fathers of monster movies dream up some pretty weird stuff, but I bet they couldn't come up with anything quite as strange as what we're hunting now.
This is a bit more of a stretch, but without seeing what's wrapped around the line, it's a bit hard to do much than guess.
Neither of those however, is positive, so as a roundabout way of getting back to it - I'd bet that yes, the term 'gold plated commandos' would be intended as a pejorative in some fashion. As to exactly what fashion, that's a bit harder...