This is what the Gospel Principles manual says about Outer Darkness:
These are they who had testimonies of Jesus through the Holy Ghost and knew the power of the Lord but allowed Satan to overcome them. They denied the truth and defied the power of the Lord. There is no forgiveness for them, for they denied the Holy Spirit after having received it. They will not have a kingdom of glory. They will live in eternal darkness, torment, and misery with Satan and his angels forever. (See D&C 76:28–35, 44–48.)
Note there is no mention of needing to see God or Jesus. Or to have a perfect knowledge. Just garden-variety "testimonies of Jesus through the Holy Ghost" and knowing "the power of the Lord." Maybe the members who read this are getting the wrong idea in concluding that all ex-Mormons who once bore testimony of Jesus and Mormonism are bound for OD, but can you blame them for getting that idea? It would be easy for the manual to include some of the quotes listed here in previous posts about how the numbers of people bound for OD are actually very few. Previous manuals did include such quotes. But this one doesn't. So, it appears that once again, Simon Belmont doesn't know what he's talking about. The church does teach that your garden-variety ex-Mo is bound for OD. Maybe the church didn't use to teach that, but it does now.
Of the Telestial kingdom, the manual says:
These people did not receive the gospel or the testimony of Jesus either on earth or in the spirit world. They will suffer for their own sins in hell until after the Millennium, when they will be resurrected.
Note there is no mention of people who accepted the gospel and then turned away. No, the telestial is for those who never accepted it. Which leaves only OD for the ex-Mormon.
"The Church is authoritarian, tribal, provincial, and founded on a loosely biblical racist frontier sex cult."--Juggler Vain
"The LDS church is the Amway of religions. Even with all the soap they sell, they still manage to come away smelling dirty."--Some Schmo