This "recommended" size is not an official recommendation, nor does it mean there is a problem if the logs surpass it. All of these files are actually pretty small, biggest one is just over 7MB and this is the syslog.log which is expected to grow a lot depending on the amount of syslogs your devices are sending to LMS.
There is absolutely nothing to worry about here. You can either just ignore the "recommended" size or modify it to higher values using the CSCOpx\conf\logstat.conf. In newer LMS versions you will find the logrotation utility under CS > Server > Admin > Log Rotation. You can configure log files to rotate here if they are occupying too much of your hard drive.
