apologies everyone!Both 5x and remaining 5x will count towards this month's capping
I can confirm from experience
The remaining 5X are exclusive of current/next month statement. I made a detail check on my Dec and Jan statements and this is what I've found out:
Dec statement:

Jan Statement:

though I had utilised 11360 out of 15K accelerated points cap in Dec, my remaining 6900 points were credited in Jan without any deductions.
This means the remaining 5X accelerated points are exclusive in its entirety.