[[Through a process called horizontal gene transfer, any organism can theoretically swap genes with another.]]
Which only, according to my understanding, happens between the same kinds of species- not between unrelated species kinds because unrelated species kinds have several layers of protectiosn which prevent such horizontal transfers whereas related species kinds have the necessary info to receive and utilize dna from their own kind
All told, the little water bears have about 6,000 genes that come from outside sources, mainly bacteria. Plants, fungi, and Archaea also made appearances in the tardigrade genome.
Unless bacteria, plants, fungi and tardigrade are all the " same kinds of species" then this would appear to be something new mixing animal, plant, bacteria and fungi. Archaea are already a strange lot and are themselves extremophiles.