That's the rule the old geezers at the Academy insist on. But then you have idiotic situations where everyone is using "le" for e.g. the COVID virus, while Academicians cry about the D meaning "Disease", which is feminine, making it "la COVID" in their book. As for all languages, the most important rule is that usage prevails. And that's something we in France still have a hard time integrating into public discourse.
An interesting case is "WiFi", short for "wireless fidelity". "Fidélité sans fil" in French should be feminine, but every technical person says "le WiFi" (masculine) while many (most?) non-technical people intuitively say "la WiFi" (feminine).
If you keep your access point secure and in good working order, or if you can flash any firmware into OpenWRT... make sure to publicly credit your excellent "Wi-fu"
Better keep the wifi working, or your waifu could get angry.