No, the MX1A-21NW is a normal switch. Like a Cherry MX Black but even stiffer, intended for space bars. Grey key stem. See the bottom of
this page for info.
If you are planning on using a alternate action MX switch for a Caps Lock key , then you need to make yourself a custom controller for it. There is a special code for a locking Caps Lock in the USB HID spec, but it is not recognized by Windows.