Yes, in the eyes of the IRA all traditional/SEP/SIMPLE IRAs are one account. Therefore, the pro-rata rule would still apply.
Line 6 Form 8606 instructions state: "Enter the total value of all your traditional, traditional SEP, and traditional SIMPLE IRAs as of December 31, 2024, plus any outstanding rollovers."
The Backdoor Roth only works if your traditional/SEP/SIMPLE IRAs don't have any pre-tax funds. If you plan to use this strategy in the future you might want to think about a reverse rollover where you rollover IRA money to a company plan, like a 401(k). Only pre-tax funds can be rolled from an IRA to a company plan. Therefore, you would isolate the basis and could start the Backdoor Roth procedure fresh. But it only works if your employer allows it, not all plans do.
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