They've been about a week since they were last in the ice and have since been sailing in flat calm ice-free waters so they probably wanted to generate some excitement? Unlike the earlier ice though no-one was up on the bow looking at it (although it only took half an hour to transit).
The observation lounges are rarely at the bow, in most cases the bow-section is off-limits, prohibited to access to passengers because it's a dangerous place.
Observation lounges would be in a nice warm saloon behind strong windows though.
Either way I don't know of course, it was just an idea because why else should they take the ice-route when a safer ice-free route is available in abundance further south