reg you may not be required to switch to UC if you are still eligible for SDP

Hi
has any one on the forum heard of or knows any thing about the information stated below

Certain individuals may be excluded from moving to Universal Credit if they receive a Severe Disability Premium (SDP). The following conditions apply:

Existing SDP Recipients: If you are currently receiving a Severe Disability Premium as part of your legacy benefits, you will not automatically be moved to Universal Credit.

Managed Migration: If you are in the process of managed migration and receive a migration notice, you may not be required to switch to Universal Credit if you are still eligible for SDP.