No, I would see them as being complementary and potentially for different use cases, but I assume the article you referenced is the one which illustrates how LTI and SSO can be used together.
simplSAML/sihibboleth and LTI
we use
LTI to connect to other Moodles and
simplSAML/sihibboleth to connect people normally within an access federation
I saw this article from Chuck Severance
Are there any plans to converge ?
regards Paul
Re: simplSAML/sihibboleth and LTI
No, I would see them as being complementary and potentially for different use cases, but I assume the article you referenced is the one which illustrates how LTI and SSO can be used together.