Could North Korea's larger launch cells be intended for Russian hypersonic missiles?

Could the larger launch tubes be intended for hypersonic missiles that Russia might supply?

Possibly, but the idea remains speculative and could reflect an aspiration rather than an available capability.

Larger launch cells could reflect a hope that Russia would eventually supply hypersonic missiles. That possibility rests on expectations or promises of uncertain value, rather than a confirmed missile transfer. Another possibility is that North Korea is displaying an intended capability before it can make it work. The launch-cell dimensions alone do not settle what the ship can actually carry.