All my ducati's I've owned squeal like this under hard braking and similar noise from my KTM dirt bikes . IMO the culprit is the brembo, the reason is performance.
My guess is this is due to the other manufactures brakes are HIGH Chromium called stainless steel and the brembos are HIGH carbon steel sometimes called stainless steel . but in my opinion the brembos are simply high carbon steel .
here is an ad for brembo discs for example :
Why should you choose Brembo discs?
Increased 5mm rotor thickness provides a balance between durability, performance and weight - whether on track or road
High Carbon Steel has better Friction and Heat Absorption properties than OE or cheaper high Chromium content Stainless Steel replacement discs