Not necessarily.
Lockheed Martin has been involved in a number of VLO reconnaissance/surveillance UAV projects in the past, i.e. RQ-3, X-44A, P-175 and the famous RQ-170.
Hence, if the information from that guy is true, I do believe that said RQ-180-successor is highly likely to have further upgrades and enhancements on various capabilities and performances compared to its predecessors, while still following the "VLO, flying wing, high-altitude RQ-UAV" family lineage.
Wanna bet a (V)VLO flying wing that flies somewhere around 70, 80 or even 100 thousand feet, while maintaining intercontinental range capabilities?
That is a good point. Though you think they would just stick with Northrop in that case no? They already have the RQ-180, so why go with a totally different vendor?