As Artifexian, the creator of this video, explains, this may be a big coincidence. However, you can ignore the uncertainty and use this idea for your languages in your fictional world. For example, the Pakti tribe, which lives in the mountains, settles the uninhabited plains. The great Bagde nation has voiced the Pakti voiceless stops and lowered the Pakti vowels.
Evidence for Direct Geographical Influence on Linguistic Sounds: The Case of Ejectives: http://goo.gl/AKc1s7
Response Article: http://goo.gl/QwygtC
Climate, Econiche and Sexuality: Influence on Sonority in Languages: http://goo.gl/uu7WMs
Climate, Vocal Folds and Tonal Languages: http://goo.gl/UwTb5l