I agree with Cascabel and GEdgar: this usage of post seems very unlikely, at least for native speakers.
The Oxford English Dictionary records six different verbs post. They are all listed as regular verbs, however, with no special notes. I also looked at the Merriam-Webster, Lexico, American Heritage Dictionary, Collins, Macmillan, Cambridge, and Wiktionary. They all concur.
As to how you could figure this out on your own online: first, except for the OED, all the other dictionaries are freely accessible, and their not recording any usage of the kind you mention is good evidence that it is not part of Standard English. Second, you can try searching the Corpus of Contemporary American English (COCA) and the British National Corpus (BNC) for POST_v (post as a verb). There will be many hits, but in a couple of hours you could go through them all. Similarly, you could search on Google Books for such things as 'post a', 'post the', 'post it', etc. I doubt you will find any hits generated by native speakers. It is of course hard to prove a negative, but this will be another good indication that the usage you report is not part of Standard English.