Segment does not really affect Epsilon, it just has an applied effect while equipped to it. You would have to negate Segment to target Epsilon, which is not something Lance does. If equipped card was something like United We Stand, than Epsilon would not gain attack from it, because it directly affects it.
Aditionally, if United We Stand also said that equipped monster cannot be destroyed by battle, you still could not do that after using Lance. If you Lanced hero targeted with Mask Change, it would not go to the grave and opponent would be unable to summon from extra deck. Because sending monster to the grave is directly affecting it.
Coz they're afraid that Konami might visit this site and find un-authorized images of Cards. So they scan their own hard-copy of cards and upload it. Meanwhile, kids visit this site everyday but they haven't revised their comments section. Can't blame spammers if the site itself is negligent.