Rest assured, You are NOT being rude.
Sometimes the written word is misunderstood.
Back to the basic question concerning pre-mix availability.... just keep looking; it's out there somewhere. Maybe you may need to provide transport.
CMU grout is product specific. It must contain added aggregate, to the cement, for strength. Most common and easiest to use is a pump-able mixture containing no more than 3/8 inch stone.. sometimes referred to as 3/8 minus... or 1/4 minus stone.
When pouring, do not allow voids in the cores.
(probably Youtube has videos)
Is the CMU detail, above, from your prints or identical?
You original question seems to have expanded to wall design... has it?
Assuming it is a foundation wall, fill all cores.
You should send a written RFI to the Architect AND the PE for a call out specification.
Oh, the frustration you so well describe is common clarification challenges that Pro GCs handle daily. We don't like it but are accustomed.
You always wanted to be a GC, right? 😆 With the honest eloquence of your plaint, you you have a great start... you're beginning to sound like a GC. 😆
Lesseeeee' uhhhh.. another thing.
When asking the building dept any question.... do not ask HOW to meet code.
Present your solution and ask, "will this suffice to meet the code requirement?"
If not.... "Where does it fail that code requirement?" You may, or may not, receive an answer to the second question.
Hope this is beginning to help you take a deep breath and relax a bit....
consider the aggravation as tuition paid for the learning.