This looks very fishy to me. The publishing CERES Institute is just three people who are not associated with any major research institution (and two of them appear to be father and son). In their About section, they state:
"In recent years, the scientific community appears to have prioritized defining a 'scientific consensus' [...]. We believe this obsession with 'forming a consensus' contradicts the ethos of true scientific inquiry and open-ended scientific research."
So, to me, this looks less like a real scientific study but like some people who just want to prove climate science wrong.
And, yes, like @rini17 writes: We do track temperature with satellites mostly. And not just since yesterday.
We use Whereby for quite a while, and it works very well. It runs in the browser and does not require any installation (I think they are based on Jitsi).
Why is it even necessary to show a political map in this movie? I haven't seen it, but I doubt that territorial claims by China are part of the story...