Witnessing the world’s tallest indoor waterfall 🌎 #hsbcrainvortexsingapore @ Rain Vortex Jewel Changi Airport Singapore https://t.co/218TWUt7KH
<a href="http://instagram.com" rel="nofollow">Instagram</a>
Central Region
[{'url': 'https://t.co/218TWUt7KH', 'expanded_url': 'https://www.instagram.com/p/B7CwtYzhQYI/?igshid=1engx833syxkd', 'display_url': 'instagram.com/p/B7CwtYzhQYI/…', 'indices': [120, 143]}]
MARINA CENTRE
['witnessing', 'world', '’', 'tallest', 'indoor', 'waterfall', '🌎', '#hsbcrainvortexsingapore', 'rain', 'vortex', 'jewel', 'changi', 'airport', 'singapore', 'https://t.co/218twut7kh']
['airport']
indoor waterfall rain vortex jewel airport
witnessing world tallest indoor waterfall hsbcrainvortexsingapore rain vortex jewel changi airport singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This post is not related to maintenance report feedback for public flat house."},
    ]

The given Twitter post does not relate to a maintenance report feedback for a public flat house. The post is about witnessing the world's tallest indoor waterfall at the HSBC Rain Vortex at Jewel Changi Airport in Singapore. Therefore, the answer is a JSON object with "relatedness" set to False, "type" set to "none", and "explanation" set to a short explanation of why the post is not related to the requested topic.