I don’t think anyone is claiming that Bazel is “the same thing” as distcc. But they both solve the problem of distributed builds.
I think that if you’re reading a suggestion to “just use X” on Hacker News, the sensible thing to do is to evaluate the suggestion for your own. You don’t need to put a long list of caveats in front of every software recommendation. If your problem is, “My builds are slow, I want distributed builds,” then you should probably at least consider the two most popular solutions to that problem, which are Bazel and Distcc. Both with their drawbacks.