Is Prophet Muhammad Omnipresent ?

The following article was published stating that the prophet’s spirit is omnipresent at all times (may allah bless him & give him peace). below is most of their article and their proofs. is what they say the truth? 
it is the contention and the belief of the ahle sunnat wal jamat that the holy prophet(sallal lahu alaihi wasallam) is : (a). present & seeing at all times , (b). aware and witnessing the creation of allah , (c). able to be present in several places at the same time . 
" 'o' nabi (communicator of the unseen) we have sent you as a witness." (s33 v45). 2). "then how shall it be, when we bring up a witness from each nation (of each prophet) and 'o' beloved messenger we will bring you as a witness and guardian against all those." (s4 v41)
observe that the holy prophet(sallal lahu alaihi wasallam) is being called a witness to all the nations that allah has put upon this earth. therefore, the holy prophet(sallal lahu alaihi wasallam) must have been present before his earthly appearance and is still present after this earthly demise, otherwise he cannot be called upon as a witness in the true sense of the word. there are many other verses of the holy quran that call upon the holy prophet(sallal lahu alaihi wasallam) to be a witness. and a witness can only be someone who is hazir & nazir.
a technical point: the following quranic verses are often quoted to show that the holy prophet(sallal lahu alaihi wasallam) was not present and seeing before his earthly appearance : "and you('o' prophet) were not with them(present) when they cast their pens(to decide) which of them should be mary's guardian." (s3 v44)
"the prophet was not present when musa was called upon tur" (s28 v46) yes, the holy prophet(sallal lahu alaihi wasallam) was not present (physically speaking) at these .