This user changed his/her password recently.
So nothing to worry? Because I got similar case!
When I rated him for alts, see what I got-
"Simply accusing me of double accounts i bought this account from him so stop simply accusing me of alt account. I bought for 2$ so i don't know what is your problem." -lavi2001
Lol! This is the world, we have to bare!
You accused him for spamming with alts and he negged you back because he didn't like what you did.
When the people were about to make a business with that account, they will see your and his accusations and will check each account. And then they will decide and see who's telling the truth.
If he's an alt acc spammer like you told, there's nothing to worry.
side note: i didn't check his profile but i ignored a few qtum spammer accounts recently and they all created in the same day. There is definitely a qtum spam going on.