I’d like to know if TIME Magazine employs a style guide. The answer is of course “yes”, but do they have style guide of their own? And is it publicly available?

In particular, I’d like to be able to see what their views are on the placement of only (he only had/had only one chapter to finish). The reason I’m asking is that my search for this construction in the TIME Magazine Corpus produced fewer instances of had only (the prescribed variant) than only had (the criticised form) for the last decade which I looked at (the 2000s). The decrease suggests that only had is now no longer the prescribed form. Does anyone have any views on what may have happened in terms of TIME’s editorial style? And can anyone help me find access to TIME’s styleguide if such a thing exists?