Nah, appeal it. I'll help if you need

Having been on an academic performance plan in the past because I wasn't treated for ADHD at the time, I have to say that you don't want to give them the chance to even build a case/body of evidence. If you disagree, fight them on it, because it'll just be a lecturer being a lazy fuck.

Break into their office and cough up poop pellets on their desk.

So, appeal this.

Collate all the documents for the assignment, especially the rubric for marking.

Annotate your assignment, marking each piece of feedback that states that you missed x with a value (either a number or letter) and highlight the section or passage where you directly addressed this bit that you "missed".

Make a case.

Or, alternatively, take each piece of feedback, quote it as a sort of header, and then quote the section of your assignment where you did actually address it. E.g.:

You did not address Engels' influence on Marx

...and although Engels was often not credited by Marx as a co-author, Engels' influence on Marx was undeniable throughout his works. Engels would serve as editor, collaborator, inspiration, and occasionally devil's advocate to Marx, as exemplified by the letters they exchanged throughout their lives.

Stick it to them.

Always appeal. Always bird dog the professor (politely).

so if I fail a class or get a low GPA I could be kicked out of the university

That's some real bullshit, wtf, and I'm sorry comrade this happened to you

Sorry to hear that. What degree? Yeah, most university assignment is just "what the class instructor wants." Not blaming you personally, but in most take-home assignment, it is more efficient to just come to office hours, pretend you don't know anything, to get a gist of what the person on the other end of grading wants. It's the limit of written communication that sometimes people just misinterpret what the other person wants.

I'm in academia and it does not get any better. The system does not reward rogue scholar who leave it to last minute and do what he/she/they wanted. For a proposal in my field, half of the proposal writing is corresponding with the program manager (in my case, NSF) trying to decipher and understand what they wanted within the scope of the RFP (request for proposal) and tailor your proposal towards that goal. I've been a co-principal investigators in many proposals where the principal investigators left the proposal to last minute, didn't kiss ass/correspond to program manager, "misunderstood/misread" the RFP call and goal and got a perfectly solid idea thrown out because it is "outside the scope of the call."

Within framework of a class, with some instructors you can argue about a grade not from the perspective of the assignment, but how you see and interpreted the assignment. Sometimes you can get an understanding instructor that see it from your POV and get your grade rectified if you have done enough work (even though it is the wrong work)

Your student union may be able to help, contact them

FUCK PEOPLE. FUCK EVERYTHING. ✊

Also: 🫂