Are they or did the dev just test on the slowest pc they had and said that will do ?even with that, min specs on games are much higher than the graphics horsepower that the original PS4 and Xbone had.
for example
quantum break
NVIDIA GeForce GTX 760 or AMD Radeon R7 260x
according to gpu boss gaming benchmark (21 games) those 2 cards are not equal the 760 is 50% faster
now it could be different for that particular game but more likely they were the slowest cards tested