Via The Points Guy, Southwest is backtracking on their change that removed the ability to earn the Companion Pass with hotel point transfers, but only through March 31st.
Primarily, this means that you can once again use Marriott Hotel + Air packages to earn the Companion Pass (requiring 270,000 Marriott Rewards points or 90,000 SPG Starpoints). So if you had been eyeing one of these packages, you now have about three months.