Opera House.  Only the very upper crust Chinese Society frequented. @ Chinatown Singapore免費食物吃不完的秘密基地 https://t.co/6uM15VN1Uh
<a href="http://instagram.com" rel="nofollow">Instagram</a>
Central Region
[{'url': 'https://t.co/6uM15VN1Uh', 'expanded_url': 'https://www.instagram.com/p/B7ZrX5Pg2Kk/?igshid=1le8vkyghvi39', 'display_url': 'instagram.com/p/B7ZrX5Pg2Kk/…', 'indices': [102, 125]}]
CHINATOWN
opera house only very upper crust chinese society chinatown
opera house upper crust chinese society frequented chinatown singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This post does not relate to a maintenance report for a public flat house."},
    ]

It seems that the Twitter post you provided does not mention anything related to a maintenance report for a public flat house in Singapore. The post mentions the Opera House, which is a cultural institution, and the Chinese Society, which is an organization that promotes Chinese culture. It also mentions Chinatown, which is a district in Singapore with a high concentration of Chinese population and culture. However, there is no mention of a maintenance report or any other issue related to public housing. Therefore, the answer is that the post does not relate to a maintenance report feedback to public flat house.