That Times of India article makes it sound as if the virus is mutating to become more deadly and to present more symptoms. Not true. It is mutating, but in places on the RNA strand that make little difference. If it did mutate on the spike protein enough to make vaccines ineffective, the spike protein probably would not work to get it into the ACE II receptor. So such mutations probably have occurred already, but there is very high selective pressure for it not to spread. (RNA viruses do tend to mutate a lot because they don't have the corrective capabilities of DNA.)
All those "new" symptoms are not new, just rare or not well-reported. For example the GI symptoms unreported led a lot of American doctors to rule out Covid-19 with any patient reporting diarrhea. But one report did say that 50% of Wuhan patients did report diarrhea as their first symptom. This wasn't in some early reports, and some reports say 5%. I don't know why. Maybe the food sanitation in Wuhan makes diarrhea so common they didn't consider a symptom? Maybe it's a cultural taboo to mention it?
