Those Safariland speedloaders and speed loader holders are not illegal in IDPA.
Many top shooters, including those that work at IDPA Headquarters are using the spring steel Shoot-the -Moon moon clip holders in IDPA competition. They are also using Safariland Comp III speedloaders with the long spring loaded handle, held in Safariland spring steel belt clip holders.
I bought the Bainci Accumold double speedloader pouch to use last year. It has a Velcro flaps that are very fast to open. It holds speedloaders or moonclips.
This year I noticed every one else was using the spring steel clip holders. I went to those, too, to keep up. Now I also see the Comp III's in use unless the shooter is using moon clips.