No, in this case the pre-arrival planning is NOT a "Club Level" perk, it's a perk of Platinum. In fact, the Platinum IPO (which does your pre-arrival planning) is in a completely different office from the Club Level Concierges. Some of the CMs work in both, but they are two different organizations.
Platinum Plan does NOT automatically include Club Level amenities (lounge access, etc), unless you pay for a Club Level room. Sometimes people on the Platinum Plan are upgraded from regular rooms to Club Level rooms, but this is extremely rare (possibly nonexistent) on one-night Platinum Plan stays.
I have also heard of a "pixie dust" type situation where someone on an extended Platinum Plan stay in a non-Club Level room was not upgraded to a Club Level room, but was allowed access to the lounge by the Club Level Concierge. This was definitely an unusual situation and was no doubt due to the guest spending a ton of money to stay on Platinum for two weeks.
I am 100% certain of this information, both from discussing it with the
travel agent I work closely with (who books many Platinum Plan vacations and knows the Club Level and IPO staff well) and from my own personal experience.
Mary
MouseSavers.com