The svartalves were actually helping Harry with his claim against Marcone.
Yes, Battle Ground page 384 Harry confronts Marcone saying that he, [Harry] defended his home and lost his own home in the process. Then;
I pointed at Evanna.
Everyone looked at her.
"There was. . .damage to the apartment during the attack," she politely lied. "No replacement at apartment at this time. As such he can no longer be our guest."
Now for a couple of reasons Evanna may have found it awkward not to back him, i.e. Thomas is Harry's bother, Thomas was also Evanna's lover, little details that she might not have wanted made public at the time. Whether it came down to personal reasons, or she had been filled in that for now at any rate Thomas was being punished for his deeds by the Winter Knight and Warden of Demonreach, she chose to back Harry on this.