Since APM 9.7 the collection of BtStats by TIM is no longer controlled by the TIM Setting BtStats/Enabled.
In APM 9.7 there was an RTTM architecture enhancement for user groups.
APM Installation and Upgrade > Install and Configure TIM for CA CEM > Configure RTTM for User Groups
Since that change the BtStats/Enabled property is now stored as flag "enabled" in the new TIM config file btstatsconfig.xml as.
The "enabled" flag is only toggled when the CEM RTTM child service (parented to Tim Collection Service) is started or stopped.