I dont think it is slop - Mike Sartain has a pretty lengthy history including working at Valve. The README file's last commit was from 5 years ago, which is likely why some of the links 404
Still one of the better free options for kernel-side GPU debugging on Linux. Reading ftrace/perf events into a timeline gives you a view of the GPU scheduler that neither Chrome tracing nor vendor tools really match. Pairs nicely with perfetto for the system-level picture. The amdgpu/i915 event parsing has aged surprisingly well for Mesa work.
[1] https://ui.perfetto.dev/
Does
not work for you? It works for me, and is how I expect to have to open nearly all images. [0][0] ...though sometimes I have to add a Shift to the click to bypass evil right-click disabling scripts.
There are several links to 404 pages in credits section which makes me think this project is a total slop. Hope I'm wrong.