I am non denominational so I’ll share my perspective. The Holy Spirit through the prophets dictated Scripture. That being said it doesn’t make sense that the Holy Spirit would be bound by scripture sense He’s the one who wrote it for “our instruction”. As an example God made time (presumably) but He is not bound by it because He is the one who made it, therefore His authority is greater than it. God/Holy Spirit cannot make anything that greater then Himself because he is the utmost.
That being said there are many that abuse this authority and claim outlandish things, citing the Holy Spirit as the director of whatever action/teaching they are undertaking (As there was in the days of the apostles, see Jude). These men will bear their judgement. From my perspective an unction from the Holy Spirit to do or teach something should 1. Not contradict Scripture and 2. Align with the character and qualities of the Holy Spirit and of the wisdom found in Christ as demonstrated in the Scriptures.
The scriptures are to point to Him who is all in all, He who is found both within and without the Book, it is our instruction not our law book, if some abuse that then again they will bear their own judgement.
In regards to the 2 Timothy scripture I see Paul warning Timothy about the “quality” of teaching, that it would turn into man pleasing rather than what is True. Paul was preaching before he was sanctioned by the Apostles to do so (Acts 9:20) That being said I am not about to deny the mess of protestantism/non denominationalism because it’s bad. Every man is doing what is right in their own eyes because they have shunned the authority over them (thanks Luther

) and from that have taken free reign to do what that 2 Timothy scripture says.
I typed this on my phone so please excuse any typos