I am currently out of the country and I am ACE certified GF and Red Cross WSI.
The tests online that then allow you to immediately be “certified” if you pass after paying a fee cheat the professionals looking to learn.
I have been aquatic certified by AEA https://www.aeawave.com/ for almost 20 years. I know they have online certification now but also, prepare you for teaching real people. Having WSI isn’t applicable to Aqua fitness. I’ve also supervised many instructors and lifeguards. The best instructors I’ve worked with were also certified by this organization. They did not necessarily have lifeguard experience.