There's a correlation between increased testing and an increase in the number of cases, but correlation is not necessarily causation. Strawman: an asymptomatic person is required to take at test to return to work and tests positive. Such a case would not have been previously counted before testing was more available. However, I would think (dangerous, I know) a "reasonable" person would only seek a test if they were exhibiting symptoms. If there are more symptomatic people being tested, this would be evidence of community spread. There is a host of epidemiological data being collected to trace origins, but the data is not consistent and therefore not readily compiled across broad geographic areas. Someone smarter and more well read than me would be able to parse the statistical difference between increased transmission and increased testing and whether it's significant.
With regard to the decrease in deaths, I refer to what AC wrote earlier this afternoon. The medical community is learning more about the virus, how if effects different people, and what treatments to employ at different times during its course. In my mind this is resulting in fewer deaths. But there is still much that remains unknown about why so many remain asymptomatic, some previously healthy people are struck severely, and others who have seemingly recovered have lingering and unusual complications. With community spread, the goal remains to maintain adequate surge capacity in hospital ICUs, keep healthcare professionals healthy, and encourage physical distancing to reduce community spread. It's likely the virus will spread to up to 70% of the population, before herd immunity kicks in, unless a vaccine is developed in the short term. (Source: https://coronavirus.jhu.edu/from-our-experts/early-herd-immunity-against-covid-19-a-dangerous-misconception). For the foreseeable future, keep your contact bubble as small as possible. Outside is better than inside, mask is better than no mask, distance is better than close proximity. I think we all understand that some are more risk tolerant than others. But be mindful of those with compromised or suppressed immune systems, as they are inherently more vulnerable to catching the virus and less able to fight it off.
As for the media, if it bleeds it leads. We come here for a-hysterical information about the weather. It's sometimes harder to be an a-hysterical consumer of news.