Different WCO's have different interpretations.
On a local DHALO, one pointedly asked me if I had scented worms (which I didn't) and said not to use them. Few days later, another WCO was patrolling and I asked him if scented worms were OK (still didn't have any, just asked out of curiosity). He said they were fine.
All WCO's I've encountered on DHALO areas are fine with trout magnets and other unscented soft plastics. I personally won't use anything scented or the like because (1) the way I read the regs they're illegal and (2) the way some WCO's read the regs they're illegal.
I'd rather not pay a fine.