Yup, that's what it says here...

https://itstillruns.com/honda-civic-...s-6088156.html

"The Honda Civic radiator is constructed with plastic tanks and an aluminum core. The good quality metal radiators are no longer used, in favor of the more lucrative and easily manufactured plastic versions. The center core is simply crimped to the plastic tanks with a gasket between the core and tank. This creates a multitude of possible leaks; however, the most common cause for leaks on the Civic radiator is cracks on the top tank next to the radiator cap. The pressure in the radiator splits the upper tank, resulting in a long crack just above the core. It is a good idea to pressure test the radiator if no obvious cracks are seen."