@sp38
Form 5498 is not part of your tax return, it is provided by the IRA custodian, and reflects what you actually contributed in 2021. The custodian must report your contributions as made, they can't "net out" the corrective withdrawal.
When the IRS reviews your account, they will see (1) a 2021 contribution, (2) a 2021 tax return with a level of income that makes you ineligible to contribute, and (3) a 2022 distribution with code P. That should be enough for them to figure out what you did. At worst, they may send a letter asking you to provide more details about the missing $1500.
"“Do you have any excess Roth contributions? Tell us if you contributed more to a Roth IRA than was allowed in 2022 or any previous year.” - Should I list the $6k excess from 2021 here?"
No, because you removed it.
"“Contributions Withdrawn Before the Due Date. Enter any contribution that you withdrew before April 18, 2023.” - Should this be listed as $6k for the amount I contributed to my Roth IRA for 2021? Or listed as the amount actually withdraw post-loss, $4.5k?"
No. This is asking about excess 2022 contributions withdrawn before April 2023, it is not asking about excess contributions from 2021 that were withdrawn before April 2022. If your income for 2022 is low enough that you are still eligible for the $6000 contribution, you have no excess to remove for 2022.
You already dealt with 2021 correctly on your 2021 return. There is nothing to correct for 2021 and you have no special circumstances that require reporting or adjusting on your 2022 return.
