PS2021 which version does not have rounded rectangle tool?

If I'm right Rounded Rectangle Tool was removed from Photoshop 2021, but if you record by Script Listener / action making a shape of this tool you can still use it in later release.

documents.add(uv = UnitValue(100, 'px'), uv, 72)
sTT = stringIDToTypeID, dsc2 = new ActionDescriptor()
objct = {top: 0, left: 0, bottom: 100, right: 100, radius: 25}
for(i in objct) dsc2.putUnitDouble(sTT(i), sTT('pixelUnit'), objct[i]);
(dsc1 = new ActionDescriptor()).putObject(sTT('shape'), sTT('rectangle'), dsc2)
dsc1.putBoolean(sTT('antiAlias'), true), executeAction(sTT('draw'), dsc1)

  PS2021 which version does not have rounded rectangle tool?

If I can understand your question correctly then answer is all versions of Ps 2021 have Rounded Rectangle Tool. Not only 2021 but also and previous versions that you may be able to install through CC app also have Rounded Rectangle Tool.

Photoshop now uses an Illustrator like corner handle so the rectangle shape tool can incorperate radius corners