It’s a hill I’m willing to die on ;)
Both octopuses and octopodes are terrible words.
And words are made by us, you cannot tell me what's a word and what isn't.
Octopodes is correct if you want a classical (Greek, as it is) word. Octopi is an assumption of correctness by analogy of people who don't know better, like 'if you have any feedback give it to my colleague and I' - it's not all posh and correct to say 'and I', it's wrong (in that sentence).
Why I took the time to comment: I recently watched an excellent 2-part series entitled "Octopus!" on Prime Video:
https://youtu.be/u1TLQUH43Yw?si=L8Ta4RG1Kp8tkHWU
Phoebe Waller-Bridge, the narrator, must have said "octopuses" a hundred times, so it's kind of burned into my brain.