That’s legacy code, not technical debt. BTW. If you leave the company, who will understand your code though? Institutional knowledge always fades away eventually.
Technical debt is something that hinders the ability to understand the code and how changes will impact the code. A hypothetical technical debt-free piece of legacy code could be picked up by a new developer and they'd understand it perfectly after reading it.
I haven’t seen such high quality, ever, in a production codebase.