Correct, MT data isn't listed on the summary report. The sensors have their own reports page however A: it doesn't draw properly and B: you cannot schedule reports from it.
IMO the reporting side of things from the Meraki dashboard could do with improvement. I cannot see anyway of getting sensor information out of the dashboard as it looks like SNMP & Syslog don't support MT data and I cannot find anything on the API but I only had a quick search on it.