Yes, a secondary modern is the school you go to if you don't pass the 11+., where there is an 11+ to be taken.
So only applies to the few areas where the 11+ is compulsory. I don't see anything in the proposals for the 11+ to be made compulsory nor for grammars in all areas nor for compulsory conversion of comps into sec-mods.
In many towns and cities, a grammar can sit quite happily alongside a range of comps, the 11+ isn't compulsory, parents and pupils can happily ignore the 11+ and just choose from the other comps. It's all a matter of improving choice.
That's why I don't recognise those who complain about a return to sec-mods - that's not the proposal at all. The proposal is simply getting rid of the ban on new grammars. It may not lead to more than a handful of new grammars being created, maybe none at all. It's just lifting the ban so that a new grammar can be built if there's a need, and I assume there will be regulations etc to control who, when and where.