You are 100% correct!
I did just that. I got on Google chat and was transferred to a specialist. Here is the chat exchange:
"For the new carrier unlocked Pixel 7 Pro, can the OEM bootloader be unlocked when in developer mode? It seems there's many brand new carrier unlocked phones that have an encrypted bootloader that cannot be unlocked, the OEM unlock button is greyed out on these new phones due to encryption and can never be unlocked."
"understand that you have questions related to unlocking the bootloader in the developer mode for your Pixel 7 Pro device."
"Actually, I am only thinking of getting this phone. I do not own one as yet since I am doing my deep research on it first before I commit to spending the money on it."
"understand your concern.
I wish to share that, all the devices purchased through Google store are bootloader unlocked and can be used on any carrier.'
"As a hardwre specialist, I'm sure u understand why I am asking this question. Really all I ask is the answer to my question regarding the OEM"
"Yes, I got your point. Rest assured all the devices that are purchased from Google Store are bootloader unlocked."
"so if I understand u correctly, that is purchasing a Google store Pixel 7 Pro, that this phone will come to me both carrier AND bootloader unlocked."
"Yes, that is correct."