Sounds like yet another example of 'trendy business-speak'.
In fact it seems to be mainly used by lawyers, especially in India.
From an Associated Press story in September 2020:
What came to be called the "flash of genius doctrine" resulted from a U.S. Supreme Court case called Cuno Engineering v. Automatic Devices (1941), and it was applied as a test for innovation until the Patent Act of 1952 declared that "patentability shall not be negatived by the manner in which the invention was made." In other words, to qualify as an invention, an innovation does not have to be extremely technical or impossible to understand for the average person.
And from the Indian News Nation site in November 2019:
Since coming into being in 1952, Rajya Sabha has passed 107 constitution amendment bills out of which one was negatived by Lok Sabha while four have lapsed on its dissolution, the Upper House Secretariat said.
We do allow
negativing, but it is classed as a rare word.
Negative is very infrequently used as a verb, so
negatived will be treated as rare from now on.