Time for a new bike, obviously.

Or, you're probably fine. I ride my gravel bike and MTB through some pretty dirty/mucky conditions on a regular basis. After I ride, I hose it off, wipe it down, and re-lube the chain. All good. My road bike gets the same treatment when it needs it. The components of a road bike aren't significantly more delicate than those of a gravel bike or MTB. Actually, my first gravel bike was all road components (Ultegra).