There was some further information in Mgronline.com from 01/07/20.
Police Colonel Suppharoek Phankoson, Chief of Police at the Surat Thani Immigration Bureau, disclosed to reporters that at approximately 1.00pm on the 28th June the foreigner had entered Nopaporn Pharmacy on Soi Green Peach, Hat Rin in Koh Phangan. He claimed that the medicine he had purchased several days earlier from there hadn't worked and then assaulted the 44 year-old pharmacist and demanded his money back, as seen in the video.
The police have identified him as Mr Benjanin Stuart Reed, an American citizen, who entered Thailand on 14/03/20 on a 30 day visa expiring on 12/04/20.
Mgronline.com also revealed that the American had been involved in a previous similar incident on Koh Samui at a motorcycle hire shop, before travelling on to Ko Phangan and assaulting the pharmacist.
Police are currently searching for him and believe he is currently hiding out in Krabi or Phuket province.