First of all the Govt. decision says its not compulsory; I dont have a problem if somebody issues a fatwa, after all a fatwa itself is a guidance system not a compulsion (correct me if i am wrong)
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Ultimately it should be left to the individual decision.
However If that fatwa is issued after interpreting the fact in a twisted manner then everybody has the right to question the validity of it.
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Those who consider "surya namaskar" as a religious belief should first understand the meaning of sanskrit word Namaskara.
From Cultural perspective :
Namaskara is derived from word "Namaskriya", (means: "Performing a salutation"); for the purpose of "swavadhika utkrishtapooravaka jnananukoola Vypara" (means: acknowledging opposite party's superiority than myself while we are in need to trade certain benefit/knowledge from him)
Thus its a cultural thing rather than a religious one. So whats wrong in acknowledging Sun's Superiority than us while we are taking so much benefit from that entity. No need to consider him/her/it as the supreme being/entity.
Kindly note that Salutation is different from Worship. For worship of sun god there different words such as puja, upasana, havana etc.
IF we go by Literal Menaing: Namaskar means a form of salutation.
Salutation: A gesture or utterance made as a greeting or acknowledgement of another’s arrival or departure. (From Oxford Dictionary)
Do these Mullas have problems in acknowledging the existence of Sun ?? If true, before issuing fatwa on surya namaksra these Mullas should issue it for the the activity of "Greeting" !!!