They did, apparently, at one point pay someone to build that glue, and then threw it out and wouldn't let the author release it so he's been reimplementing it out of...spite? Burning desire? Unclear. [1]

I can't imagine the logic involved in "this is implemented, let's toss it in the dumpster" for that.

[1] - https://vosen.github.io/ZLUDA/blog/zludas-third-life/