Biggest Gold Bull Market in History (Sale pitch)

Why Australia Could Be the Epicentre of the Biggest Gold Bull Market in History.

A lot of knowledge of gold history in the sale pitch but a good read of what might happen in the future going by the past.

......LINK.....


https://pro.fattailir.com.au/p/x6rocgoldstocks/PROCX601/?h=true

Less I'm way out mathematical wise Geof,  He states (further down) "Now overall, Gold has risen 25% since March 2020"  Price as at 31st March 2020 were $1583 US. Current price of gold today $1822 US.  $1583+15% = $1820. So where does this overall gold price jump of 25% come from?
Now I'm either way off my estimations, or could this be some new form of confusing shananiganism taking place, in order to fleece the pockets of potential investors?
Mind you Its just my reasoning & that I could be completely wrong in what I have said?

Kon