The phrase "also proof that the" is correct and usable in written English.
It can be used when you want to indicate that something serves as evidence or confirmation of a particular point or claim.
Example: "The recent findings are also proof that the theory we proposed holds true under various conditions."
Alternatives: "also evidence that the" or "also a demonstration that the".
They're also proof that the world is full of accidental actuaries.
The victory is also proof that the conquest of smallpox was not just an unrepeatable fluke, a golden medical moment that will never be seen again.
She assertively performs a rewritten version of Prince Buster's extravagantly sexist 10 Commandments ("Thou shalt not listen to Prince Buster, or any other man offering kindly advice in matters of my own conduct"), her presence a counterpoint to the dominant (older, male) force on stage, but also proof that the Specials' 40-year campaign against injustice resounds down the generations.
Every doping case is initially a disappointment but also proof that the system works".
Mertens' team is also proof that the idea of social impact oriented companies attracting talent away from larger established organizations is an expanding trend.
The technology behind the Within-produced "Hallelujah" is a technical feat for the Mountain View-based Lytro, but it's perhaps also proof that the venture-drenched startup hasn't been all that unhinged in betting so heavily on light field tech.
The massacre in Peshawar is seen as a result of the pain it is facing, but also proof that it retains the ability to strike vulnerable targets in Pakistan.
Though they do have two generational players in De Ligt and De Jong, they're also proof that with clever management, the right tactics and a proper mentality, you can do amazing things.
It is also proof that still images still have the power to pack a punch.
It was also proof that nearly two decades after the Central Intelligence Agency had succeeded in destabilizing Marxist President Salvador Allende by making the Chilean economy "scream," similar tactics could be employed against a leftist, Latin government while winning broad bipartisan support in Congress and in the U.S. press.
As well as making its founders and investors rich, Lyft is also proof that a company can go to the markets telling investors that "someday" it will have a margin of 20%, but without saying when that day will be.
