Buck Converter Error Amplifier Input Polarity Confusion (TL598)
If you look at just the opamp circuit, both articles have the same opamp function
OUT = function(I+ - I-)
using the labels that I tagged on.

For TI, the opamp circuit is hooked up such that
OUT_TI = function(5V_OUT - VREF)

For Dean's, the opamp is hooked up such that
OUT_DEAN = function(VREF - 5V_OUT)

Therefore, at OUT, the polarities are opposite
OUT_TI = -(minus) OUT_DEAN
but otherwise equivalent.

Now look at the TI circuit diagram, the bubble (circled in blue) implies inverted level. Even without the bubble, the function of "PWM Comp" block (or the "CONTROL CIRCUIT" in Dean's) is not completely spelled out, so one may assume the control level is designed to work as intended regardless.