I read the entire page. That really doesn’t lend itself to subjective interpretation just individual responsibility. He also adds a disclaimer of the risk but says it’s better than the alternative.
If believers A, B, and C each has an individual responsibility to interpret Scripture, and they, after praying for enlightenment by the Holy Spirit, reach three mutually incompatible conclusions, it is not at that point possible to say whether all of them are wrong or whether one (at most) is right. This leaves you with the same result as "subjective interpretation", doesn't it?
This "Baptist distinctives" web page makes the sensible rule that "Ones interpretation should be compared to those of mature Christians past and present for possibly gaining a better understanding"-- which gives us echoes of a sensus fidelium or "hermeneutic of continuity" type of discernment--- good idea, says I.