The traditional 2000X/3000X series hack never worked on the 1000X series, so it is strange seeing that message. The only SW hack is the one from FERCSA but it does not show any warning message.
I don't think it is a hacked scope, because all the options (MASK, SGM, EDK, WAVEGEN, DMV, RML) are standard for the DSOX1102G and I don't see the serial decode options which is the only option that can be purchased on this scope (except for the BW upgrades). The only option that is not standard is BW10 (100MHz upgrade) and you might lose it if you install the original firmware from Keysight.