Standardized register 

Croatian (hrvatski jezik) is a standardized register of the Serbo-Croatian language... - to claim that is simply not true, because "standard" Croatian is not only Croatian language. 

Standard language in Croatia is Serbo-Croatian, or batter to say - some form of West Serbian language. - so there is no dispute about that. However Croatian language, real Croatian language (one you can easily find in thousands of books, epics, poems...) has nothing to do with Serbian language. That is something no one seems to understand.

Croatian language is almost extinct language which haves no Institution to govern its development. Today in Croatia, Croatian language is forbidden, and is used only in everyday conversations but not by public media, government... or other official institutions.

The term vukopis is used to describe "violence" done to actual language by changing Croatian language to almost unrecognized form by political force and totalitarian Yugoslav régime. That Serbian (better to say "Vukovian", because vukovians are Croats as well) violence is the only reason why today's "standard" Croatian language is almost the same as Serbian language altogether.  

Kratko i jezgrovito rečeno: prošlost je jezika hrvatskoga sjajna, sadašnjost mračna, budućnost neizvjestna... U djelima se (ranijih) književnika zrcali pravo biće jezika hrvatskoga, pravopisa i porabe jezične. Sve je to obrazbeno blago u XX. st. odvrženo i poslano u ropotarnicu poviesti... Budući nam je izvorni književni izraz hrvatski iz mozga bez traga izpran, ... unatoč mnogostoljetnoj svojoj poviesti, hrvatski je jezik danas lišen prošlosti. - Bulcsú László

Briefly and succinctly said: the past of Croatian language is a great, the present bleak, the future uncertain... In the works of the (early) writers reflects true being of Croatian language, spelling and precise use of language. All this is slightly transformed by the twentieth century, overthrew and sent to the dustbin of history ... Since our original Croatian literary expression has been from our brain washed without trace ... Despite its many-century history, Croatian language is today devoid of his past.- Bulcsú László

This is the stand of preeminent Croatian linguists, so the article needs to express this, and say that "standard" Croatian language is Serbo-Croatian, but Croatian language isn't.

Exapmle 1.
Kolo od srieće uokoli
vrteći se ne pristaje:
tko bi gori, eto je doli,
a tko doli gori ustaje.
Ivan Gundulić

Exapmle 2.
Svit je taščina.
Taščina od taščin i sve je taščina,
ovi svit jest osin i magla i hina.
Marko Marulić

Exapmle 3.
Nut poglejte kako srićučlovičanski ljudi išču:
ki z navukom med knigami,ki z oružjem med vojskami;

ki u dvoru prislužujuć,z neistinom prilizujuć,
drugim na zlo potverduju,što je krivo potribuju.

Ali srića je bižeća,malo kadi obstojeća,
vsi ju žele, nasliduju,retki pako dostiguju.
Fran Krsto Frankopan

Reading this examples, one can clearly see that Croatian language has nothing to do with "standard Croatian", with Serbian or Serbo-Croatian language.