It sounds like Wahoo are on the brink, so I wouldn't count too much on a warranty from them anyway. I'd be comfortable buying second hand, I don't think there's a huge amount that can go wrong with a trainer.
Are Wahoo on the brink?
Sounds like it: https://www.cyclingnews.com/news/wahoos-credit-rating-downgraded-again-after-defaulting-on-payment/
@dbr started
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It sounds like Wahoo are on the brink, so I wouldn't count too much on a warranty from them anyway. I'd be comfortable buying second hand, I don't think there's a huge amount that can go wrong with a trainer.