From the study Watchtower
During the great tribulation, we may receive instructions that seem strange, impractical, or illogical. Of course, Jehovah will not speak to us personally. He will likely provide direction through his appointed representatives.
He will LIKELY provide direction through the FDS during the GT? They don't even know if Jehovah will provide the GB with direction.
They are telling the R&F to follow these instructions even if they are strange, impractical, or illogical and now to do it even if they don't know if it is from men or from Jehovah because they are admitting that they only think is is likely it is from him - not definitely.