Can a third-party app delete the partitions?
Not for free.
You can make a free bootable version of
GParted live CD or USB.
But it will need to be able to "see" the drive.
All the 3rd party partitioning software, now charges to be able to make it's bootable media.
Here's my copy of Minitool Partition Wizard bootable ISO image...
It might be able to "see" your 2TB drive ?
Burn to a CD or use RUFUS to put on a USB stick.
www.dropbox.com
You'll need to temporarily disable Secure Boot, so this can boot.
Turn Secure Boot back on to install Win 11.
Try "format" during the install... that may get you to the "delete" partitions part.
I honestly don't remember. Last time I installed Windows was in May 2020 (Win 10).
I just did an In-Place Upgrade, to get from Win 10 to Win 11.
I use backup software... religiously.
Which, seriously cuts down on the number of times you need to install Windows.
From the way MS is headed, I'll probably have to a clean install of Windows 12.
Win 10 was different enough to need a clean install, coming from Windows 7.
I think Win 12 will be different enough from Win 11, to need a clean install.
In 26 years, I installed OSes four times.
Win 98 SE, Win XP, Win 7, Win 10. That's it.
Backup software plus the In-Place Upgrades, pretty much cover everything else.