Mac Air 13” Wi-Fi Hardware Issue
In a word, yes.

If I may 'esplain. While it is possible that a board level repair shop might be able to resurrect the system to full functioning. Cleaning, drying and the like.

You didn't specify the model year of your MBAir but in this case I am not sure it matters as MBAirs are famous for being small and light and generally not upgradable. I believe (not sure but pretty sure) that the WiFi radio is likely integrated into the system board and not replaceable. Or not easily replaceable unless you find someone to do board level repair and have them replace the damaged components.

If a new Mac is not currently affordable you might find a USB WiFI adapter that is Mac compatible and that would give you WiFi at the expense of having a USB stick sticking out of your MBAir all the time.