I know Mardel has a bunch of different things like this. My only comment is that 2 is a bit young for him to really understand the chart. Most boys aren't really ready to use the potty until 3 frankly. Just be sure he's showing the signs (Google this), can really talk or communicate and wants to use it. Otherwise, you're in for a world of (avoidable) frustration. Unless he's interested, he's not going to do it. It needs to be his idea and not yours imo.
The more you push it, the more he's going to push back. Boys are notoriously late learners. My son potty learned pretty early (2 1/2 and it was entirely his own doing) but I noticed that his friends were all about 3 when they decided they wanted to use the potty. When they did, it literally took a few days, no charts or other incentives were needed, and they had little to no accidents. Like my son, they just decided they wanted to use it. He only has one friend who is still in diapers at 3. He's just not ready yet physically. It is no reflection on parenting or the child's intelligence. Some kids walk early and some do it later. Same with the potty.