No, not really, it is just installing (repartition, format, copy FS) There's no flashing required, not in a sense of flashing something permanently. The flasher is just used to load the special kernel (MOSLO) that contains the partitioning utilities. Actually you do not specifically need the MOSLO kernel at all, the same autopartitioning script that is used there is also included in the ubiboot repair mode. Well yes, dualboot/singleboot by permanently flashing MOSLO is old method, not needed any longer. Ubiboot takes care of it all nowdays.