This is actually mostly still the case, I think. ELS is Caine's work; LMS supplied some stuff in AdvancedHook, but pretty much all of ELS 8 is Caine's.
Also, integrating two complex projects can be quite hard. ELS and LCPDFR aren't even written in the same language; ELS uses C++, LCPDFR uses .NET (LCPDFR includes some C++ code, but it's all in AdvancedHook, which is, in fact, common between the two). AFAIK, LMS is the only LCPDFR dev who even knows C++, and I'm not sure if Caine knows any .NET languages. Integrating two projects where only one person can write code for both doesn't normally work well. Truly integrating the codebases would require pretty much entirely rewriting one of the two (C++ talking to .NET is possible, AdvancedHook does it, but it's tedious and annoying; bolting an API onto a system not designed for one is *also* annoying and somewhat difficult), so the best you'd likely get in practice would be both distributed as part of the same download, at which point there's no tangible benefit.
Furthermore, ELS only works when you have ELS-enabled cars, and LCPDFR generally tries to avoid modifying game content if at all possible (the Taser is added, but there are no car mods bundled with LCPDFR; it generally leaves Rockstar files alone).