No it's not. They're landing on Runway 23L. TYS Approach brings traffic on the downwind, gives them vectors (heading) to final and turns aircraft inbound to join the localizer that lines them up on 23L. In this weather today, shooting ILS 23L approach.
Not that I put a lot of stock into this whole thing, as there can be anyone aboard going and/or coming from any type of business, but it has landed at TYS.
That is not a normal approach. Nor a published approach. If someone can pull the audio from atconline, see if they requested a vector to fly by the downtown.