As you note, the documentation is ambiguous.
You can see what the MIB OID will return by running a show command on the device as noted in the documentation below. This should tell you if the mac table results are included.
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/show-snmp-mib.html
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
http://puluka.com/home------------------------------