…. Here is more for you. The Guardian is not known for conspiracy's theories so I used that.
https://amp.theguardian.com/environment/2021/mar/23/us-stated-cloud-seeding-weather-modification
https://en.m.wikipedia.org/wiki/Cloud_seeding
Technically you can manipulate the weather. It's called cloud seeding if I remember rightly Saudi haves done it and China have done it for years. There was even Top Gear episode where they showed it. The HAARP stuff though is pure conspiracy which I gather is what Matt is probably referring to.