According to this article the body wasn’t burned.
snip...
The discovered body is not believed to be the result of the Tick Fire, according to Arteaga.
“The human remains are not burned as of this time, they were just remains found in a burned area,” said Arteaga, at approximately 3:10 p.m. on Saturday.
As investigators worked on the scene they said the public works employee had discovered a human skeleton that they believe to have been in the area for more than a year, according to Lt. Derrick Alfred, LASD Homicide Bureau.
“We don’t have any reason to believe that this is a victim of this fire or previous fires,” said Alfred. “It looks like the body may have been concealed up here or was here in the vegetation and after the fire, the body was revealed and found by the public.”
UPDATE: Human remains discovered in Tick Fire area