First, he has missed the reporting deadline. He just hasn't passed the point where he loses credit for a year in terms of the difference between being an RFA and a UFA. But showing up for the beginning of training camp is a contractual obligation, which he's broken two years in a row.
Secondly, he got paid more than $1 million last season. He did get a nearly $5.7 million signing bonus, for his 4 years plus a team option contract. That counts too.
In terms of providing more value than his contract - just as he is not expected to return the signing bonus if he just didn't play up to that level, the Rams are not expected to pay him more if he exceeds the level of value. The contract works both ways - demanding the Rams make up the difference is trying to have his guaranteed cake and eat it, too.
Now, in fact, the Rams have been trying to reward him for his performance. He has turned them down, wanting (apparently) a lot more than a record-setting contract. They even didn't punish him with fines last season for violating his contract by missing OTAs and training camp. Apparently, no good deed goes unpunished for the Rams.
I understand why AD is behaving this way. I like money too. But he's not being virtuous, just trying to get what he thinks is fair for his past of being underpaid - i.e., as much money as possible.