In general, Industry 4.0 is more focused on productivity, specific to supply chain.
Here in Automotive, Industry 4.0 (L4) includes e.g. connected cars. Since V2X is already a concept and available solution, hence what issue of V2X we can take as part of L4(Industry 4.0) is the question?
First of all...in general it's a common, industry 4.0 and the whole IT industries is shifting towards it. It simply means making way for concepts like Artificial intelligence, cloud computing etc., A V2V communication isn't a part of industry 4.0, maybe it will pave way for automated driving , something which automotive Giants are working into.