No, KittyTac appears to be out of date, as DFHack appeared a lot earlier than expected. The latest version of LNP (at least) contains DFHack (alpha version). I think the issue is more fundamental:
In order to use the script (and any other DFHack tools that are not integrated into DF by DFHack), you have to invoke it from the DFHack console.
If DFHack is enabled with DF (I haven't checked if DFHack is enabled by default: alpha versions frequently are not, in which case you need to go to the Utilities tab and enable DFHack [I think, I'm on LNP r02 with locally compiled and manually installed DFHack as I don't actually play yet]), a DFHack console is started together with DF. If no such window appears DFHack isn't enabled.
Once you get a DFHack console window when you start DF you then invoke non integrated DFHack commands/scripts etc. from the console by typing their name, in this case "regionmanipulator" (without the quotes and with a return at the end). That will either start the script or result in an error message (such a a failure to find it). Note that you should invoke regionmanipulator only when your embark rectangle is inside the desired embark region, as all manipulations done by the script are completely wiped when focus changes to a different region (moving the embark rectangle inside the region does not destroy anything, but be sure to use the correct key, as I tend to accidentally use the world movement keys instead...).
Another way to see if DFHack is available prior to embark is to see if the DFHack embark options are integrated into the pre embark screen (as well as the sand indicator, which is also a DFHack addition).
As to any late-ness: You're the one who's potentially "suffering" from delayed play start. I'm not in a hurry for you to start