First, you keep posting a link to the group's own press release. That's not exactly an unbiased source. But let's just go ahead and use their numbers, because they're still very obviously wrong about the overall argument.
Second, the Rio Grande Valley is much bigger than the 49 acres of land SpaceX is asking for, and the Boca Chica site is at the very farthest eastern end of the river. In fact, it's probably more accurate to think of Boca Chica as part of the Gulf Coast rather than part of the Rio Grande Valley. For reference, the Rio Grande Valley is the southern bottom of Texas, and Boca Chica is pretty much a dot on the Gulf Coast just above the Rio Grande. I don't have the exact numbers, but I'd guess that it doesn't quite make up 1% of the land area of the RGV.
Third, Boca Chica State Park is completely undeveloped, and is only open during the day. There are no, repeat, no facilities in the park. The road doesn't even stay paved up to the beach. Your precious hotel taxes? Not from Boca Chica, because there are no hotels there. Sales taxes? Not from Boca Chica; there isn't so much as a lemonade stand. So the money that your group is mentioning does not even a little bit come from Boca Chica, unless you count any parking fees, of which there appear to be none, as there don't appear to be any parking spaces at the park. It is literally just a beach.
So, no, it doesn't affect jobs, and I wish you'd quit tossing out the same link to the same damn article from TFA above. Here, here's a link from Texas Parks and Wildlife: http://www.tpwd.state.tx.us/huntwild/wildlife/wildlife-trails/coastal/lower/boca-chica-loop. Boca Chica is #43 on the map.
Here's a link to the Wikipedia entry: http://en.wikipedia.org/wiki/Boca_Chica_State_Park. You can see some pictures of the place. The only development appears to be two old wooden fenceposts which show where the road stops, and a rusted-out oil drum for trash. Unless Texas hired someone specifically to drive out, straighten the fenceposts, and empty the trash, Boca Chica does not currently offer any significant employment opportunities.