To be more specific, someone in another F-16 that is part of your flight or donor group has transmitted their selected Steerpoint, SPI, or SEAD Target over Datalink. The MKPT529 indicates that it was stored as Mark Point 529. They start at 500 (or is it 501) and increment up each time you receive one. You can select the steerpoint to see what was transmitted by pressing the STPT button on the ICP and enter the number.
I take this was on a MP server. This means someone probably bound the HOTAS button assigned to "Transmit Switch - IFF IN" to something like Discord or SRS PTT and doesn't realize every time they long press it, it transmits their selected STPT, SPI, or SEAD target to all of their flight members and donors.
You can fly around at MIL power all you want, and you're not going to hurt the engine as long as you don't exceed 1100°C FTIT. When possible, cruise as high as possible. At higher altitudes the air is thinner, and even at full MIL you won't make full power anyway. This past Saturday I was RTBing over 200 miles and fuel was tight. I was at 38,000ft and at full MIL the RPM maxed out at 93%.
I do similar to Exorcet, and climb at full MIL power maintaining 350KTS IAS. When I can no longer maintain 350KTS IAS, I climb at 2-3° until AOA gets to 5° and level off to gain airspeed, then start reducing power to maintain 5000-6500PPH fuel flow. Generally with a heavy A-G loadout, I'll make 20-25,000 ft and set 6000-6500PPH, and A-A I go for 30-35,000 and set 5000-5500PPH.
One of the CRUS pages shows the optimum altitude for fuel efficiency. At that altitude, full MIL power will also give the optimum speed.