I think you only get one free replacement on the extended warranty. And, I don't believe that the replacement unit is eligible for another extended warranty.
HF has gotten taken advantage of too much in the past, and they are closing their loopholes... especially on the "big ticket" items.
Brian & Becky
2018 Avenger ATI 27RBS
Weber Q2000, Blackstone 22", and a whole herd of flamingoes