I got a 16 kg and ETK and I started doing those workouts and interval running on the variety days, and I switched my diet

I got myself seriously overtrained. Trying to do too much new all at once. Very stupid of me.

I dropped the running, and did ETK only, my diet is high protein and and vegetables. I lost about 20 lbs.

So yes, to answer your question, you will lose weight using only kettlebells if you follow a SENSIBLE diet. I'm using an ab wheel as well, and now in my mid 30s I'm starting to get a six pack again.