Does to move from pillar to post mean always on the same?

English Language Tests, Intermediate level

ESL/EFL Test #353 [color=blue]“English Slang Idioms (74)”, question 6

“That guy just moves from pillar to , doesn’t he? He is always losing a job, starting a job, moving away, moving back he needs to get it together,” his dad said.

(a) arch
(b) roof
© floor
(d) post

English Language Tests, Intermediate level

ESL/EFL Test #353 [color=blue]“English Slang Idioms (74)”, answer 6

“That guy just moves from pillar to post, doesn’t he? He is always losing a job, starting a job, moving away, moving back he needs to get it together,” his dad said.

Correct answer: (d) post

Your answer was: [color=red]incorrect
“That guy just moves from pillar to floor, doesn’t he? He is always losing a job, starting a job, moving away, moving back he needs to get it together,” his dad said.
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Does to move from pillar to post mean always on the same?

No, it means going from one place to another - and possibly back etc.