Yes mate.
I started taking my own powders to my maggot supplier to use instead of the maize/dust they offer. I tried liver powder, GLM, and various grounbaits.
I found that nothing was more effective than un-touched maggots. In fact I actually started asking for my maggots un-cleaned, straight from the trays (my supplier is a maggot farm). The dirtier and stinkier the better imo.
The article says "as soon as they start sweating, they start getting Ammonia all over them. The fish just veer off them because that Ammonia is a really bad chemical, they really don’t like it".
That is a load of tosh imo. Maggots secrete various substances/chemicals including ammonia as part of their natural processes, this imo is part of what makes them so attractive to carp. No processed food/bait can match these natural processes in terms of attraction imo. All those substances/chemicals (which I'm pretty sure are stuffed full of AA's), together with the tiny electrical signals given off by live maggots, are what make them so unbeatable in terms of bait.
I do not believe maggots can be made more attractive by adding anything.