FWIW when I have seen the word 'presence' it has been referring to the mid/upper mid range. I agree with Soix. But I would opine that your dealer was telling you these speakers would just be too small in your large (enuf) room, something you could cure with good well set up sub woofers. Another WAG though. :-)
Can you have too much speaker presence?
My dealer says I’d lose too much speaker presence if I went to a smaller speaker. I’m not posting the speaker in question solely because I don’t want this to become an attack on them. I get it, presence means there and in the area, but can too much become and issue, especially when it is centered in a specific frequency range?