Late instantaneous development of lump after SculpSure, could it be a fat cell hyperplasia?

SculpSure has the potential to create "nodules," which are essentially fat cells that are being broken down and trying to stick together. As stated by others, increase massaging, use NSAID's and use warm compresses. Also make sure you are staying adequately hydrated, increase water intake.
The delay in appearance is due to the rate at which your body is breaking down the fat cells. There are several reasons why you may have gotten one this time, but not the previous treatment. There is unfortunately no way to tell exactly the cause.
In the trials, most nodules resolved in under 3 months, with proper care. Follow up with your provider to have an exam of the area and seek further recommendations. 

It is possible to get some lumps after having a SculpSure procedure.  This is usually due to swelling and inflammation as your body breaks down and mobilizes the destroyed fat cells.  Massaging the lump can help speed up the resolution and anti-inflammatory (NSAIDs) can help reduce the swelling.  Check with your doctor to address any concerns.  
To my knowledge fat cell hyperplasia has not been reported with SculpSure though it has been reported with CoolSculpt.

Lumps ( from fat death or fat necrosis )after sculpsure are not uncommon . Every case is different and if you were to be advised to spend 10-15 min a day  of massaging the treated areas perhaps this could have been avoided. It also depends if you had some previous surgeries, C section, abdominal surgeries, plastic intervention in the treated area ( in these cases this could be a result of residual fibrotic tissue). In any case deep massage, warm compresses are the only options you have. I would call my MD and ask to evaluate and decided on when the next treatment should take place.
Time is the main factor. Give it 4-6 months and if still not resolved and do bother you a sonogram could be considered.