The title is a bit misleading. This directive seems to target 3rd party H-1B contractors such as Tata and Infosys, rather than 'High Tech' companies that directly hire engineers such as Google, Apple, and Microsoft. Companies that hire H-1Bs directly and employ them onsite shouldn't be affected by this policy change.
I think the linked CNN Money article provides a better explanation of the motives behind this change http://money.cnn.com/2018/02/23/technology/h1b-visa-abuse/in...