No clue whether Walz is a skilled debater.
The debates from the 2022 Minnesota gubernatorial election are on YouTube. Three debates in the 2022 election and three in 2018.
Walz comes across as more stilted in the part of one debate from 2022 that I’ve watched than he’s appeared on the campaign stump in 2024.
Bear in mind that Walz was running against a guy named Scott Jenson, an MD, who’d become enamored with Covid-19 conspiracy theories (see Ivermectin, Hydroxychloroquine, anti-vaccine - particularly mandates and vaccines for young adults and children). Jenson even cited conspiracy theorist Dr. Peter McCullough in the part of the debate I watched.