Nailit's personal account isn't verifiable to anybody else (at least on AB) and is presumably not based on any active scientific research, so it is more or less exactly the textbook definition of "anecdotal evidence".
The claim that the virus is impossible to control is also clearly not true, depending perhaps on your definition of control. But the graph of positive cases has very clear points where it suddenly rises sharply, and then just as suddenly dips again, and the dips almost always correspond to increased restrictions being introduced. Prime example: over September and into October, the number of positive cases began to show exponential increase. Then the entire country was put into Tier 4 for November, and that increase slowed, stopped, and then started to reverse again at the end of the month. Those restrictions were then relaxed at the end of November, and to nobody's surprise the exponential increase started again very soon afterwards. But, since full(er) lockdown measures were reintroduced at the start of January, that increase has rapidly been reversed, and new cases are declining sharply.
It will take time, and perhaps stronger measures still, to reduce the spread down to a few hundred new cases per day, but the suggestion that the virus cannot be controlled is, at the very least, far too stringent. To eliminate it altogether may be a forlorn hope, or at least beyond the will of the present Government to introduce and enforce the required measures -- but to bring it under control? That's doable. There's no need to be defeatist.