Shouldn't affect them. Platform scripts and Remediations both execute through the Intune Management Extension, so they aren't governed by the LocalMachine execution policy W365 is moving to RemoteSigned.
If 'Enforce script signature check' is off, IME runs the script with Bypass, which sits above LocalMachine in scope precedence and ignores it. If it's on, the script already had to be signed by a cert in Trusted Publishers, so RemoteSigned adds nothing new.
The actual gotcha is precedence: MachinePolicy and UserPolicy override LocalMachine. If AllSigned gets pushed at MachinePolicy via Intune or GPO, that overrides the new default and is what fails provisioning, resize, and restore. That's the thing worth auditing.