Trust them, they are right on with the instructions. This instruction pops up a great deal on patterns so you will get used to seeing it and after having done it a few times, you will be an old hat at it! You can do it!!!!
70, knit 8, k2 tog leaves, 69, knit 8, kn 2tog leaves 68, knit 8, kn 2 tog, leave 67, knit 8, kn 2 tog leave, 66, knit 8, knit 2 tog leaves 65, knit 8 , etc. When you knit 2 together, you still have a stitch instead of 2 so you are only getting rid of one stitch not two. I think what may be confusing you is you are possibly seeing the knit 2 tog as getting rid of 2 stitches but when you do the actual knitting 2 together, you will see that by doing the knitting two together, you still have a stitch on your needle. I hope that is not clear as mud. I just know that when I was a newbie, stuff like this, though simple used to throw me into a tail spin.