Based on my experience forum profile backlinks will not hurt strong/aged/established websites.
Even for new registered domain, this method is relatively safe, because google will find it slowly over time, backlink will steadily growth. So, there is no sudden increase of 1000 backlinks in a day with this method.
But if accidentally google find its way to crawl all 1000 newly created backlinks, the worst scenario is sandbox - your website will disapear for a moment, but will be back with the higher position in google.
conclusion: if your website is aged, you can use my service with confident, no worried of sandbox or banned.