It's hard to be certain if he's telling the truth, especially because there are no guaranteed odds in gambling. If anyone is reaching out to OP, my advice is to be cautious and contact him at your own risk. Remember, trusting anyone on the internet can be risky. Avoid clicking on suspicious links to prevent potential loss from malicious attacks. Winning in gambling relies on understanding the game you're betting on.
Be careful when dealing with unknown individuals offering free odds on Telegram. OP, what's your motive for giving free odds? There's usually nothing truly free online, so is there another intention behind it?