This compares the memory use by SSIS to the Other Used Memory statistic that SentryOne collects. If this evaluates to true, SSIS is certainly using more memory than it has access to, and is having to swap to disk. As other processes are no doubt using some of the "other" memory as well, this is an indicator that SSIS may have overrun available memory by quite a bit. See the processes tab in SentryOne during problem package execution for more insight into how much is being used.
Development notes: Need to see if the Perf Counter category is version dependent. This may need to be changed based on SQL Server Version.