If you don’t want to budge on remote part-time you should find out early in the process if that’s a deal-breaker. You can ask about policies or whether other people in the group work remotely without insisting. It’s not an unusual thing to ask about these days. If the company has a hard “everyone in the office” rule then you can pass.
When looking for a job you need to do some research. You want to find out about salary and benefits, work conditions, etc. You should have that information before spending time in interviews. Once the company expressed interest by making an offer you are in a position to negotiate.
My point is to avoid filtering or creating obstacles early in the process, when you are not in a strong position yet. It’s a sales tactic. If the company wants you they will probably have some flexibility. How much they will accommodate depends on how valuable they perceive you as.
I worked expect many companies will want you working in person for a while so you can integrate with the team and company, and so you can show your manager and team that you can deliver without a lot of direct supervision.
