http://www.navweaps.com/Weapons/WTRussian_post-WWII.htm
While it does have a wake-homing mode that is not simulated in DW (yet), it is most definately not wire-guided.
Your source is the only one I've ever seen listing it as wire-guided, and given that it is a peripheral reference in a periodical about the Kursk (as opposed to a dedicated techincal reference), I'm not inclined to assign it a higher level of credibility than other sources.
Also, giving the USET-80 wire-guided capability would drastically alter the weapon balance on the Russian Kilos, making the TEST-71 completely redundant weapons, which is one of the reasons I'm not inclined to believe they are wireguided, because the Kilo submarine then would have no reason to carry the TEST-71, either in DW or in real life.
Cheers,
David