This is the commit which disabled verbose mode, just before the code which removed verbose framer logging entirely: https://github.com/gnachman/iTerm2/commit/014ba7ec40fc790f65...
This is the commit which enabled VERBOSE mode: https://github.com/gnachman/iTerm2/commit/5db0f74bf647f6d53e... (from Jul 3, 2024)
That is probably just from having set VERBOSE=1 while implementing or debugging something and forgetting to revert it to VERBOSE=0 before committing.