I'm not sure where that person got the information, since there is no link provided (you can't believe everything you read in the Internet without supporting documentation). I have never heard of star gazing symptom associated with Mareks. Mareks is a highly contagious and deadly viral disease and if this bird had symptoms for any period of time, others would likely have shown it too. He would also more than likely have passed on by now as well.
Symptoms: in chicks over 3 wks old (most commonly 12 to 30 weeks): growing thin while eating well (most common form), deaths starting at 8 to 10 wks and persisting until 20-25 wks.
in maturing birds (6-9 months): enlarged, reddened feather follicles or white bumps (tumors) on skin that scab over with a brown crust (skin form); stilted gait or lack of coordination, pale skin, wing or leg paralysis; when both legs are paralyzed, one points forward and the other points back under body; sometimes rapid weight loss, gaping or gasping, transient paralysis lasting 1-2 days, dehydration, emaciation, coma; death due to inability to get food and water or tampling by other chickens.
eye involvement: cloudy grayish, dilated, irregular pupil; distorted or blinded eye
in all ages: sudden death of apparently healthy birds
Stargazing info:
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/206934.htm&word=star,gazing
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/206914.htm&word=star,gazing