ES/Telekinesis Sorc?

I am returning to Diablo 2 after many years for Resurrected and I’ve been reading through forums and guides in regards to how

Energy Shield and

Telekinesis work together on a Sorceress in D2 Resurrected and I need a little help understanding what is meant by putting 20 “hard points” into

Telekinesis for the buff to

Energy Shield.

Do you have to put 20 physical points into

Telekinesis in order to get to the .75 or can you also use +1 to skill items (soj,

Shako, grand charms, etc…) to achieve a level 20

Telekinesis and achieve the same .75 result?
Any help shedding light on this detail would be appreciated.
Thanks!

yes, you need 20 hard points
points from items do not count towards any synergies

Thanks for clarifying