Again lowballing is based on projections. You aren't paying for him for being a 5 PPG player. You are paying believing that he will be worth more. This happens all the time with RFA deals. Sometimes it works out and sometimes it doesn't.
Projecting from very little information. This almost never happens. At least Embiid dominated in those few games he played on his rookie contract. There is currently no offer that would be considered low balling.