No

When a unit is on a Peak space, it has unlimited range when TARGETING another unit with a Missile or a Spell attack. This does not affect other abilities with a ranged icon. For example, Jolene's Rally ability increases damage done by all allies within 4 range. This ability does not target any unit, so it is not affected by a Peak. However, Lorewynn's Conjure Birds deals damage to all TARGETS in range (of its spell attack), therefore she deals damage to all enemy units on the realm map when she is on a peak.