It's impossible to code for subjectivity, but he does give some clues about the factors involved, mostly time - if it's been long enough since the break, it can be discarded. That's easy enough to turn into a rule - invalidate an S/R level n bars after it breaks. At any point before n bars, consider it a reversed level.

Yes, time is a good point I was missing.

In his article S/R Levels ? When Do They Become Invalid? he states:

“If I was trading this, I’d leave 1.5510 as potential resistance, but remove 1.5495 as no longer valid.

Why?
Because price showed a stall at the 1.5510 level before crashing lower. People bought here. Some will have lost money; others will still be holding on in desperate hope of a breakeven exit. The level is recent and is a source of emotional pain. It stays on my chart.
1.4595 provided almost no support as price slid straight through. There was likely to have been little buying here, and therefore a lot less emotional pain. This one’s gone!”

Just before 1.5510 broke, we had several bars that respected the support. THIS is what makes the brake not to invalidate the support. Just before the 1.5495 broke, there are no bars “supported” or “rested” on the line. This is the reason to invalidate it.

If something sounds too subjective, unless it comes from supernatural, to me it means we do not have a clear understanding of the rules. Acting from “experience” means that the mind is following subconcious rules, rules that we are not aware and therefore cannot describe clearly.

You are dead right. You just started a good description of the price action that makes the setup to get involved in, and the setup or better said the S/R to ignore. This PA needs to be fleshed out a lot more.

You are right also about subjectivity.

Sorry, mid-week I have no time to myself.

I have made a related question here:

evaluate Support/Resistance through momentum indicators? Hi I am trying to evaluate the Price Action around a Support/Resistance line. For example: 1) After touching a support line, price shoots up. Then the Support line gets high marks. 2) If price drops and stalls for several bars, before penetrating …

I made a separate post, since it is not strictly to Ninja programming. Rather I am looking to use indicators to evaluate the strength of an S/R line.