Yes, Meraki uses LLDP and it is enabled by default.
Here are the results of the command you provided that I ran against a Meraki switch being monitored:
- 1 devices discovered in 1.234 secs
SNMP [2/0.02s]: Snmpget[2/0.02s]
SQL [13/0.07s]: Select[11/0.05s] Delete[1/0.00s] Update[1/0.02s]
RRD [0/0.00s]: