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You are right.  means the TCPWM block number.
The suffix :0 indicates the index of the "line" outputs of the 4th TCPWM block. In this case, only one index :0 is used because the "line" output can be connected to the P2.0 pin.
For example, the "line" output of the 0th TCPWM block can be connected to P2 or P3
The alternate pin functions table indicates the tcpwm.line can be connected to one of these pins using the suffix :0 and :1