Yes those are the ones. On its own it's obviously not a clear cut winning system but it's a very good elimination method.

Points to horses not ready or passed their best or about to perform.
As always in racing it's not a foolproof standalone method if it was we'd never heard of it.

From memory Neil Yardly had it in his PricePredictor or Betselector at one stage. Maybe he still does?

I use them but it took a lot of testing to work out where and when they are of value.

After all these years I only found three and only three closely guarded standalone filters that are profitable on their own. Unfortunately they are mutually exclusive.

There may be more but you'd have to use a different approach to testing I simply can't think of a new way, not that I need to, hasten to add.
My rating works well enough, basically unchanged since 1990.

Good luck