These are reactors small enough to build in factories. That's an entirely different situation from occasionally custom building huge reactors on site. For now,

These are reactors small enough to build in factories. That's an entirely different situation from occasionally custom building huge reactors on site. For now, we should certainly keep rolling out wind and solar as fast as we can. But whether they can run entire countries reliably through all seasons is unproven so far. They're backed up everywhere by hydro where available, otherwise fossil. It's entirely possible that mass-produced passively-safe nuclear will end up cheaper and faster than the vast amount of storage/transmission/etc we'd need for a 100% wind/solar grid.