Not necessarily. I often load meat before I reach my desired chamber temp, but I will have my vent's set for 225F and see the chamber temp progressing nicely.
I don't have a Kamado but use a
WSM which is basically the same concept as your smoker. I set my vent's where they will be for a 225F fire before I add the hot coals. The chamber will get to temp more slowly, but burn cleaner.
Loading the meat early isn't a temp killer as long as you don't mess with your vents. Cold meat will absorb available heat at the grate level causing the lid therm and grate probes to show a temp drop, but the fire will still be smoking along toward 225F. The chamber will eventually reach 225F as long as you don't mess with the vents.
Every manufacturer instruction I've read says vents full open, start fire, then close vents down as you near your desired temp. That's a recipe for either chasing temps, too hot a chamber, or inadvertently snuffing the fire. Yes, it can be done, but it is more frustrating than accurate.
Think of it this way. If I told you "bring me exactly one cup of water that weighs 8 ounces," you'd put a measuring cup on a scale, zero the weight, and slowly add water to reach exactly 8 ounces. No way would you dump a bunch of water in the cup, see where you were, taking water out or adding more until you eventually reached 8 ounces. That last instruction is basically what manufacturers are telling you to do with your start fire.
Patience is key in two area of smoking meat; the beginning and the end. How you started your fire and set your vents are the culprit, not loading the meat early.