Credible link to the part in bold above please
The major driving force of the Anti-Hindi agitation was not the questioning of protecting Tamil, but questions of future of Tamils. Hindi as a suitable candidate for the official language of India after
independence was first proposed by
Motilal Nehru Report of 1928. An Official Language Commission appointed under the terms of the Constitution in 1955 to review the situation supported Hindi as the sole official language, although members from
Bengal and Madras dissented in favour of English.
[13] As of 1961 census, there were 1652 languages.
[9][13] Hindi as official language was opposed stating two reasons; the first because numbers of people with knowledge on English language was fairly evenly spread and also that imposition of Hindi would give a major advantage in terms of job and educational possibilities to those who have Hindi as their mother tongue. In effect a Tamil who would desire to pursue into union civil service would have to learn three languages, Tamil, Hindi and English, which are members of three different language families and each written in a different script. Therefore a
three-language formula proposed was seen as a great educational burden imposed on non-Hindi-speaking states.
Nehru promised in 1959 that the interests of the non-Hindi speakers will be safeguarded and so did Lal Bahadur Shastri later, but those promises didn’t put the fears of non-Hindi speakers to rest.[13]
http://www.thefullwiki.org/Rise_of_Dravidian_parties_to_power_in_Tamil_Nadu
Nehru's Promise of Federal Government
13th December 1946, J Nehru, moved a resolution in the Constituent Assembly that "States shall possess and retain the status of autonomous units, together with residuary powers and exercise all powers and functions of government and administration, save and except such powers and functions as are vested in or assigned to the Union, or as are inherent or implied in the Union or resulting there from."
when the constitution was adopted in 1950 it was unitary not federal with power resting on majority Hindi politicians as Central government is dominated by Hindi politicians