Can anyone tell me if the information on the brother’s website for the DCPT420W printer is real to make 7500 prints per ink refill?
Ink: btD60bk and BT5001
of course it is real - but to know and appreciate what that “really” means
you’d have to dive into the information that they give - what “Brother original methodology” actually means - how they got to this estimate:
**Quoted approx. yields are extrapolated based on Brother original methodology using Test Pattern ISO/IEC 24712. Quoted approx. yields are not based on ISO/IEC 24711.
the difference in ink needed between a test pattern and your real world use case can be significant - or not … 
but you already know this …
Based on a fixed reference for comparison only. It isnt a realworld scenario. Similar situation with Car manufacturers and Fuel consumption.
I spent 20 years as a printer/fax/copier repairman. I am factory trained on over 60 different printers/fax/copiers. I have serviced way over 600 different machine types.
Wet ink is used to clean the printer heads every so often. If you leave it on and dont use it , printers will periodically clean the heads, wasting ink. Secondly, wet ink dries over time. Same problem if you dont use the printer a lot. This will impact how many prints you get.
Remember the company that makes a printer makes most of its money from selling ink. They design them to run out of it fast.
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The given number is somehow reliable. I have used the same model for nearly a year, and had only refilled the black ink once. I think the number of pages I had printed were about 5000.