Surah 2:85 – If We Think the Torah Is Altered, Why Is It Wrong for Jews to Pick Parts of It?

Salaam everyone, I’m a bit confused about something. In Surah Al-Baqarah, verse 85, it says something like, 'So do you believe in part of the Book and disbelieve in the rest? What’s the penalty for that among you except disgrace in this life and a severe punishment on the Day of Standing? And Allah is not unaware of what you do.' My question is, if we as Muslims hold that the Torah has been changed over time, why would Allah blame the Jews for not accepting all of it? Wouldn’t it make more sense if they were told to keep the parts that are still original and leave the ones that got messed up by people? I mean, we believe that by the 7th century, a lot of it was already altered. So why does this ayah criticize them for only following some bits? I’m having a hard time wrapping my head around this-anyone got a good explanation? JazakAllah khair.