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The artist, Fabian Brunsing, goes uncredited by the OP, and the video (with small watermark to the artist) does not interview the designer, instead presenting the installation as mere innovation. Brunsing: http://www.fabianbrunsing.de/ Let's take a quick tour of why context matters.
2008: Brunsing's installation is a critique of capitalist policing of public spaces in Germany 2010: Officials in Shangdong province, China, took Brunsing's art & used it to do the very thing Brunsing critiqued (under guise of 'tackiling overcrowding')https://www.telegraph.co.uk/news/picturegalleries/picturesoftheday/7949682/Pictures-of-the-day-17-August-2010.html?image=10 …
2014: 'Anti-homeless' spikes were erected outside a luxury block of flats in Southwark, London. https://www.theguardian.com/society/2014/jun/09/boris-johnson-calls-removal-anti-homeless-spikes … Other cities also use 'defensive architecture' to punish the homeless, to gatekeep the poor, to deter youth from enjoying public spaces https://www.theguardian.com/cities/2014/jun/12/anti-homeless-spikes-latest-defensive-urban-architecture …
So back to the OP 'Is this art installation protesting public use of spaces by the disadvantaged "a good idea"?' Question is highly misguided. It presents critique of capitalism as neutral, removing the original position which was critiquing taken-for-granted norms about place
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