This happened to my sister when she bought a home with an inground pool.
Electrician wired things incorrectly, causing a current to flow through the water.
The next one came out and MacGyvered the thing, despite my sister insisting she wanted everything to code.
She had to toss him off the job and hired a 3rd electrician. He tore out the garbage work and redid everything to code. No more shocks in the water.
There’s a reason we have code.
I went to a website once were a guy was telling people how to DIY a 240 VAC charging outlet for an EV. He was not aware of the fact that his “technique” would only work if the two 120 VAC were 180 out of phase. Otherwise you get 0 Volts out. He was advising plugging a Toyota 120 VAC charging adapter into a 240 supply.
Furthermore, there was no scope for a GFI which seems precarious given the chance of a fault in wet weather, even inside a garage. The guy’s advice was so bad, and his technique so shoddy that I flagged it to youTube. I don’t wanna be a Karen, but anyone taking his advice is placing themselves in jeopardy. If their garage burns down, Toyota can point to the miswired outlet used for charging, so legal as well as mortal jeopardy.