I have since found that when I uninstalled it from a CLONE of the original 32bit version, those two entries disappeared one by one. At re-install, the '-show false' is what appeared in Task Manager's Startups; moreover at least four other programs had words following their paths including : /gui; /minimised; -delayrun; /auto;
in another PC with the 64bit version of the same Win10prov20H2, the program installs with "C:\Program Files\Program\Program.exe - show false" enabled. So the anomaly has charged to the two facts that there are TWO entries, and that one disabled in the original, is the one enabled in the other two systems.