Why do my led bulbs state: not for use in totally enclosed luminaires?
Yes, it is because of the heat buildup in enclosed fixtures, and no you should not use the bulb in that ceiling fixture you listed unless you are willing to accept shortened bulb life.

Your options are:


Use the bulb in that fixture anyway and accept that they may burn out or dim prematurely
Get LED bulbs that are approved for enclosed fixtures, e.g. many of the newer Cree and Philips bulbs. They will say on the packaging.
Replace the fixture entirely with a LED fixture that doesn't have bulbs at all. E.g. this similar fixture from Home Depot.
Use a CFL or old-fashioned incandescent bulb in that location and put the LEDs elsewhere.