Not true. ISP PIO, believe it was Kim Riley, said it was due to other information, tips, evidence, etc. developed since the murders, paraphrase.
http://www.jconline.com/story/news/...h-property-where-delphi-teens-found/99304450/
Could be 'evidence' was the girls being found on his property and the information/tips came from people who, because that's where the girls were found, believe he did it or was involved. LE did say they weren't disregarding any info they received, they were checking into every tip.
Just a thought..
MOO