The point we're making with that example is that among the many ways in which
like can be used are these two:
FIRST
Subject+predicate+like X (no comma), to suggest that the subject and X perform the predicate in the same manner. For instance,
Matt walks like Sarah might mean not just that both walk, but that they walk in the same manner. Maybe this makes it clear,
You can tell that Matt and Sarah are related, because Matt walks like Sarah.SECOND
Subject+predicate+like X (no comma), to suggest that the subject and X perform the predicate, but not to suggest anything about the manner. For instance,
Matt walks like Sarah might mean just that both walk. Maybe this makes it clear,
Because his car broke down at the same time as hers, Matt walks like Sarah.Notice that only context, not structure, tells you what is being compared.
Off the GMAT, not every style guide approves of that second usage, but we must have seen it in a correct answer on the GMAT if we have it recorded as a correct usage in our idiom list.