Based upon info in an AUTHORS file [0] for a different project by the user cznic, I think there may indeed be some kind of connection with nic.cz ...?
But I believe, based upon my membership on the GoNuts group / mailing list, that this is mostly the work of one individual, Jan Mercl (he is quite active in GoNuts) — as also stated in the previously mentioned AUTHORS file, and in the AUTHORS file for the port of Tcl that is the subject of the OP [1].
I have used some of his non-transpiled code/projects in my own Go projects in the past. He seems to be a very solid coder, often happy to share his views in GoNuts, and also frequently reviews others' code too.
But I believe, based upon my membership on the GoNuts group / mailing list, that this is mostly the work of one individual, Jan Mercl (he is quite active in GoNuts) — as also stated in the previously mentioned AUTHORS file, and in the AUTHORS file for the port of Tcl that is the subject of the OP [1].
I have used some of his non-transpiled code/projects in my own Go projects in the past. He seems to be a very solid coder, often happy to share his views in GoNuts, and also frequently reviews others' code too.
[0] https://github.com/cznic/golex/blob/master/AUTHORS
[1] https://gitlab.com/cznic/tcl/-/blob/master/AUTHORS