I also use a Mac with Safari and am having no problems. While I have Adobe Flash Player installed, I have it disabled for all but one or two sites.
To echo what Obeisance suggested in the Flash Player thread, you might want to disable the Flash Player for this web site. Here is how to do that (the instructions may vary a little, depending on the version of Safari you are using (I am using v10.0.3):
1) Click on “Safari” and select “Preferences”
2) In “Preferences”, select the “Security” tab
3) In the “Security” panel, check the check box for “Internet plug-ins”
4) Next, click on “Plug-in Settings”
5) In the window that opens, on the left side you should see a listing of the various plug-ins you have installed in Safari; the check box next to ,“Adobe Flash Player” should selected. On the right side “lotustalk.com” should be selected, and next to that you should be able to select “ask”, “off” or “on”. Try selecting “off”. Then, at the bottom of the window, “done”.
6) At this point you can close the Security pane.
7) To see if this worked, quite Safari, then re-launch it and go to louytstalk.com as you usually would.
VERY IMPORTANT: There are lots of security issues associated with Flash Player, and Adobe released a new version last week. To see if you have the correct version for the version of macOS and the version of Safari that you have installed, make note of the version of Adobe Flash Player that was shown in the step above (it should be listed just below “Adobe Flash Player”) and check with the Adobe website. If it is not the most current available (for the version of macOS and the version of Safari that you have installed), you should probably download and install it.
I hope this helps!