There's evidence that heat acclimation can benefit altitude acclimation
https://www.uphillathlete.com/high-altitude-heat-training-hypoxia-adaptation/
https://www.acsm.org/blog-detail/acsm-certified-blog/2017/11/26/race-altitude-heat-acclimation
https://www.runnersworld.com/training/a20792387/training-in-heat-to-prepare-for-altitude/
https://www.uphillathlete.com/high-altitude-heat-training-hypoxia-adaptation/
https://www.acsm.org/blog-detail/acsm-certified-blog/2017/11/26/race-altitude-heat-acclimation
https://www.runnersworld.com/training/a20792387/training-in-heat-to-prepare-for-altitude/