Quite the opposite, actually. All the spirits were incredibly tanky.

Now, mage heroes will have a much harder time. I remember being amazed at the armies I could defeat, for example, with Irina, using only the Summon Elemental spell. Now, elementals will be taken down twice as fast – no more miracles :)
Also, there's a vague feeling that reducing the growth rate of creatures in outer dwellings will slow down the completion of campaigns.
Overall, the impression of the patch is this: it continues the trend that started in Heroes VI – the game is becoming more balanced, but this is achieved by weakening ALL factors that can significantly affect the course of the game (as soon as they see that some ability, creature, building, etc. is too "helpful," they immediately need to weaken it).