I was on the Shadow very recently and this was the case for using the standard, free (well, included in the fare), wifi.
Maybe there is some confusion about the double options to upgrade?
Using the standard plan, one can upgrade to a second device per log in for $30 per cruise.
OR one can upgrade to the premium wifi which (very recently anyway) is $20 per day whole cruise or $29 per 24hr slot for up to four devices simultaneously.
When setting up the wifi log in it can be a bit confusing - I once upgraded from one device on standard to two when I meant to upgrade from standard to premium - I had to go to reception to sort it which they did very quickly.
Looking at the prices quoted by the OP, they seem to be a mangling of both sorts of upgrade?
Now, I'm not saying this hasn't changed but no-one else has reported a change - perhaps we must wait for further reports? I'm not back on board till November ...