I read the article as saying that the discovery of the Weyl fermion, (albeit as a quasi-particle) provides a proof of concept that it actually can exist in natu

I read the article as saying that the discovery of the Weyl fermion, (albeit as a quasi-particle) provides a proof of concept that it actually can exist in nature (rather than being just an esoteric theoretical curiosity with no physical analogue) and that its manifestation in this form provides a strong indication that it also exists as a primary particle.