The body of that website does detail that some other countries do have school shooting problems. Some of that text:
European countries have had their share of school shootings, although not as frequently as in the United States or Canada. These include eight in Germany since 1913, one in Lithuania (1925), one in Sweden (1961), three since 1967 in the United Kingdom (none after the 1996 massacre), three in Finland since 1989, two in the Netherlands (1999 and 2004), one in Denmark (1994), one in Hungary (2009), two in France (2012 and 2017), one in Estonia (2014), Spain (2015), at least five in Russia since 2014 (including events in May and Seotember 2021), one in Crimea (2018), and one in Poland (2019, no deaths).
Gun violence in Central American countries is extremely common. In Honduras, the homicide rate is many times the global average. Because of heavily armed gangs in Honduras, school shootings “are so common, they are subsumed quickly into the country's news cycle and barely register outside its borders.”. As such, the true number of school shootings in Honduras is unknown, but believed to be high. Mexico has experienced 17 reported school shootings since 2004. All of these incidents have resulted in zero to two deaths each. In each of the three shootings that had two deaths, one was the perpetrator. South Africa has experienced five school shootings since 1994, resulting in eight deaths in total.
Excluding China, several Asian nations have experienced school shootings. These include one in Taiwan (1962), two in Israel (1974 and 2008), one in Yemen (1997), one in the Philippines (1999), one in Thailand (2003), one in Lebanon (2007), one in India (2007), one in Azerbaijan (2009), and one in Pakistan. The "Peshawar siege" in 2014 was a Taliban attack that killed 145 (plus the gunmen), making it the deadliest school shooting in Asia