How much are certain attributes or skills tied to stats? Particularly when it comes to roleplay.

I’m in my first ever dnd campaign, and I have a level 5 fighter battle master who’s been a lot of fun to play. Part of his backstory is that he’s somewhat Goku-ish, he just loves fighting, he’s in the party and adventuring specifically because it’s his best chance to fight stronger opponents. Because of that interest, he’s proficient in history because he’s studied past battles to learn to be a better fighter, and he’s sometimes the party strategist in fights via coordinating plans/positions etc.

I’ve reasoned his history proficiency is largely tied to battles and not much else. It’s like if you know a war buff in real life who only knows that President Eisenhower came after President Truman because he wanted to stop the Korean War. Zero ideas on policy, but he can connect the dots based on that link alone.

Another party member has said that I’m not RP-ing in a way that reflects my characters stats, that with a 9 WIS and INT, he wouldn’t be smart enough to make strategic calls or really understand history all that much. I feel the opposite, he can be savant-ish from experience and he would at least be able to relate strategy and coordinate an offense. Particularly because in other areas I specifically don’t play up his intelligence, I as the player clocked the main bad guys conspiracy earlier on, but my character didn’t understand there even was one until it was more obvious.

I know it’s a little silly, but it’s my first game and I want to make sure I’m not committing a faux-pas by not respecting the rules or intent. Should I be playing more to his stats, or am I reasonable in assuming his class and background gives him a chance here?