These cars are not lifetime lubrication on all suspension points. The tie rods and the ball joints still have grease fittings (unless someone replaced them with sealed), and they should be greased every 3 years or 36,000 miles. The front wheel bearings are sealed for life. The rear wheel bearings should also be cleaned and regreased periodically.
Squeaking can be from many sources - strut assemblies, sway bar bushings, control arm bushings. None of these should be greased, only replaced.