Not true. Check the Texas Waterfowl Digest. There is a season for them in Texas and I know of several hunters who have taken them here. Dont know of any outfitter guiding for them however.
He was talking about them being protected in Florida.
Though I don't hear much about Purple Gallinules in Texas, Common Gallinules or Moorhens seem to be fairly common here. There was one on our deer lease pond in Young County last summer.
"Onward up many a frightening creek, though your arms may get sore and your sneakers may leak. Oh! The places you'll go!" ~ Dr. Seuss