(8.05/6.48)*10 = 12.42km at a bearing of 300° from the label.
Therefore we know that the pole is ~8.88m tall.
All we have to do to find an approximate date is play around with SunCalc (suncalc.org) and find the time/day where an 8.88m object casts a 5m shadow with a sun azimuth of 173.4°
12:06pm, Aug 20th
By verifying it, you can essentially prove that it is real and true, that what you're seeing did occur, and that it's location and date is known with enough detail to make it useful
It also fact checks the video, so that media organisations can be comfortable sharing it to their audiences.