Don't you think it's much more likely that their stack is largely Java but you were working on a largely TCL piece of it, than it is that they decided to lie and trick you into taking a job you wouldn't otherwise want?
No - I don't think that because I stayed there long enough to make sure that the lion's share was TCL. What they said they meant with "java" was that they were going to rewrite the thing in java (this -4 years later- is yet to happen afaik). Even if it were that I was to dive in their TCL hell still I was tricked big time to agree to that. I'm afraid though that this was not that uncommon as there are numerous backwater positions (aka "legacy") that are in desperate need for maintainers.
Note: that's not to be racist against TCL but things being what they are in the trade - spending 3 miserable years with TCL expertise to show in my CV would be suicidal.