JdeBPMoreover, AppCUI does not in fact run on DOS, and its MacOS, Linux, Unix, and Windows Terminal back-ends are largely the same single output system that assumes that it is talking to something that speaks ECMA-48 plus ITU T.416 plus DTTerm extensions plus a bunch of XTerm extension control sequences.
The thing that is going to chew up the resources compared to 1989 is the underlying GUI system and the modern GUI terminal emulator that they have clearly tested it with, and which it requires. Plus the full multi-planar Unicode repertoire codec and font support in the GUI terminal emulator for those emojis and whatnot in the example.