I thought they were fairly clear.
Radioexcel is making the point that sitting on the runway is neither the time nor the place to be complaining about being asked to expedite, get off the runway then moan (if you must!)
Jambo said that 2/3 of RTO's which resulted in an overrun should have been airborne. Don't know if that's correct or not but seemed fairly clear.
Please bear in mind that English may not always be the posters first language either.