I think you mean, by the context of the comment, that is no longer true, maybe is not an ortographical skip and I am mistaken on this one
Just to clarify, is not a misundertanding, usually in english if someone says " is longer true" it means it is true for a long time, but in the context of the comment, I guess what you want to say is that what many people repeat is no true for a long time, usually what you would write in this case is
" Its no longer true"
Or " Its long not true"
But no misunderstanding, just a grammatical litle note, the meaning of your comment is simple to see by the context, so just a little note
Technically