Whether it is or not, temperatures over 70 degrees are dangerous. Get your PS3 serviced ASAP if you don't want a YLoD.
So, you don't know what it means?
EDIT: My PS3 Slim's "Power" button indicator no longer blinks green when playing PS1 BIN/CUE games and PSOne Classics. Odd. I deleted PS2CONFIG (since I have CFW and not PS3HEN, use IRISMAN and not webMAN MOD and I don't have encrypted PS2 games [except inside some official PS2 Classics]), clicked on "* Custom Firmware Tools", "Updates", "xai_plugin", "Install", "Yes" and installed the xai_plugin update, clicked on "* Custom Firmware Tools", "Updates", "CFW 4.92 Fixes", "Install", "Yes" and installed the CFW 4.92 Fixes, clicked on "* Custom Firmware Tools", "Updates", "PS2 EMUs MOD", "Install", "Yes" and installed the PS2 EMUS MOD update and clicked on "* Custom Firmware Tools", "Service Tools" and "Rebuild Database", if it matters.
EDIT 2: I deleted IRISMAN and installed webMAN MOD.