Gravel Grinding Friday @ Pulau Ubin, Singapore https://t.co/c8kM9n1fV8
<a href="http://instagram.com" rel="nofollow">Instagram</a>
East Region
[{'url': 'https://t.co/c8kM9n1fV8', 'expanded_url': 'https://www.instagram.com/p/CDTGuxmnyao/?igshid=11tm9blnvetsd', 'display_url': 'instagram.com/p/CDTGuxmnyao/…', 'indices': [47, 70]}]
NORTH-EASTERN ISLANDS
gravel grinding friday
gravel grinding friday pulau ubin 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. The phrase "gravel grinding Friday Pulau Ubin Singapore" does not suggest any issues or concerns related to a housing estate or facility. Therefore, the answer is "False" for the question "Does the post relate to a maintenance report feedback to public flat house?"