Can a screen of the Programmable Terminal "NT" be created with the NS-Designer?

No. The NS-Designer cannot be used because it is designed exclusively for the NS Series.
In order to create a screen of the NT Series, use the Windows version of the NT-ZJCMX1-V4 or the MS DOS version of the NT-ZA3PC-V2/NT-ZA3DV-V-V2.