My understanding is, he is referring to the post link that is hyperlinked to the text '20 -50 times in a 12-hour period', because it states there that only 25 times/day can be claimed by those at iron1 and iron2 levels.
That's not what it says. It says that you can claim a minimum of 25 coins for the lowest rank and that is still accurate. I am looking at the information on Bitsler as I am writing this post. I can claim 25 coins up to 20 times in the next 12 hours. Maybe if I registered a new account using his referral link, that number would be 50 claims per day. Since I am not going to break the rules by posting referral links, nothing changes.
I just visited Bitsler again today and it has already changed, 50 claims per day are also now for the mentioned levels and at the starting or no level remains 20 claims/day.
Nothing has changed on my end. It's still 20 claims.