A former US Navy pilot who is now a UFO specialist has ripped the unveiling of supposed “non-human” alien corpses in Mexico earlier this week as nothing more than an “unsubstantiated stunt.”

Ryan Graves, executive director of Americans for Safe Aerospace, was among witnesses who testified before Mexican Congress on Tuesday when the two mummified corpses — complete with elongated ET-style heads — were showcased to lawmakers.

Mexican journalist and ufologist Jaime Maussan presented them during the country’s first-ever UFO hearing as apparent proof of “non-human beings.”

Graves, who had previously testified before a US Congressional UFO hearing in July, quickly slammed Maussan’s claims — saying it put a huge dent in his serious work on UAPs, or unidentified anomalous phenomena.

“Unfortunately, yesterday’s demonstration was a huge step backwards for this issue,” Graves said in a statement posted on X Wednesday.

“My testimony centered on sharing my experience and the UAP reports I hear from commercial and military aircrew through ASA’s witness program.

“I will continue to raise awareness of UAP as an urgent matter of aerospace safety, national security, and science, but I am deeply disappointed by this unsubstantiated stunt,” he added.

During his testimony, Maussan — a long-time UFO enthusiast — claimed the specimens were not related to any life on Earth.

“We are not alone,” Maussan said.

He said the corpses, which were recovered in Peru in 2017, were between 700 and 1,800 years old, adding that they had been analyzed through a carbon dating process by Mexico’s National Autonomous University.

“It’s the queen of all evidence,” Maussan claimed during the hearing. “That is, if the DNA is showing us that they are non-human beings and that there is nothing that looks like this in the world, we should take it as such.”

Similar finds in the past have turned out to be the remains of mummified children.

Maussan, however, said it was the first time such evidence had been presented.

“I think there is a clear demonstration that we are dealing with non-human specimens that are not related to any other species in our world and that all possibilities are open for any scientific institution… to investigate it,” he said.

Jose de Jesus Zalce Benitez, who is the director of the Scientific Institute for Health of the Mexican navy, testified that X-rays, 3-D reconstruction and DNA analysis had been carried out on the remains.

“I can affirm that these bodies have no relation to human beings,” he said.

Still, the shriveled bodies with shrunken heads and just three fingers on each hand quickly kicked up a social media fervor, with many skeptical of the so-called “non-human beings” and other questioning the authenticity of Maussan’s presentation.

Julieta Fierro, a researcher at the Institute of Astronomy at the National Autonomous University of Mexico, was among those to express doubt, saying that many details about the figures “made no sense.”

“Maussan has done many things. He says he has talked to the Virgin of Guadalupe,” she said. “He told me extraterrestrials do not talk to me like they talk to him because I don’t believe in them.”

The scientist added that it seemed strange that they extracted what would surely be a “treasure of the nation” from Peru without inviting the Peruvian ambassador.

With Post wires