The tautology with "some" and "included" is because if the remarks included A, B and C, that automatically means that there were some other remarks as well; it already includes the sense of "some". For example:
The Harry Potter books include The Philosopher's Stone and The Goblet of Fire.
Some of the Harry Potter books are The Philosopher's Stone and The Goblet of Fire.
Those two sentences mean the same thing.
A condition is something that must be true or exist for something else to happen. If the condition is not met, that thing cannot happen. Therefore all conditions are essential: there is no such thing as a non-essential condition, as that would be a contradiction in terms.
Tautology isn't always easy to sopt, especially as most of them (like "essential conditions") have almost become clichés and we hardly think about it. I think politicians can be blamed for a lot of them, as they try to use lots of big words to sound important.