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"In many ways Tcl is more powerful than most implementations of Lisp."

Could you elaborate on this? In what ways is it more powerful?

Also, I don't get what connection TCL has with Forth. They seem uttery different from each other to me.

One thing those three languages have in common is that they are almost syntax-less. Each, in its own particular way, allows user defined code to process tokens of the program source before it gets to the core interpreter, allowing users to implement custom control structures and DSLs.

I've seen a lot of people compare it to Forth for DSL implementation

You can delay evaluation of Tcl expressions, for one.

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