Answer:
Stratus clouds look like featureless gray to white sheets of cloud. They can be composed of water droplets, supercooled water droplets, or ice crystals depending upon the ambient temperature.
BUUUT, cirrus clouds are delicate, feathery clouds that are made mostly of ice crystals, so no. It is false, because sure, stratus clouds can be made of ice crystals, but cirrus clouds are, 100%.