there is not such kind of information about the family on the official web page for product discontinuance notices (PDN): https://www.intel.com/content/www/us/en/programmable/support/quality-and-reliability/pcns-and-advisories.html#pdn
I would recommend to you to check the newer family of MAX V with very similar features, i.e. 5M2210ZF256I5N. For the mentioned device package and capacity it is almost fully pin-compatible. One can assume that a device family introduced in 2010 will be longer on the market than a family introduced in 2004. A price comparison for these device families is interesting as well. For more information please check the link: https://www.eevblog.com/forum/fpga/altera-max-v-vs-max-ii-any-substantial-reason-to-ever-consider-the-max-ii/
For your information, the Max II (EPM2210F256I5N) device families are in mature phase and they are still recommended for new designs. It should not be obsolete within these few years but the life cycle is depending on its order volume.
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I would recommended you to look for other new alternative CPLD devices such as Max V, or Max 10 device families: