Can 地 be used in place of 的 as a stylistic choice?
I think the document has simply not been well proofread.  The usage of 地 is not consistent though.  We can see the examples like:

没错，唐三的父亲唐昊，就是一个铁匠。村子里唯一地铁匠。

So, I don't believe it's anything relevant to any dialects or stylistics.  Those are simply the errors that need to be corrected.