Just a heads up, after some consideration, I decided to go ahead with the update (see https://www.openstreetmap.org/changeset/150358221 ). 

The source page states that their location is subject to change throughout the season. The season only began on the 15th, so the risk of the source file containing errors is relatively low right now. 

Let me know if ever you spot any issues though! It's always possible to undo some or all of the changes using the JOSM Reverter plugin.