Page 48: the CPU's top speed is 233mhz (not 200mhz). That's interesting, because on the wikipedia page for Pentiums, the old classic single voltage Pentiums only seem to go up as high as 200mhz. The more modern Pentiums (dual voltage?) CPUs do go as high as 233mhz.
Unfortunately, that doesn't mean the board supports the newer Pentium MMX chips in a direct plug-in-and-go sense. All that means is that it's capable of running a 3.5X multiplier. They probably didn't know at the time the board was made that the non-MMX chips would top out at 200mhz, so they made it support 233mhz for future compatibility.
Also, the manual being published in '98 is probably due to a BIOS update or something that required a revision to the manual. I expect that the board itself made in '96 sometime, or maybe early '97. You're right that November '98 would be quite modern for a P1 board... that would've been the time that the market had largely moved onto Slot1, and the only Socket 7 boards still being made (to my knowledge, anyway) were the AMD-centered Super7 and maybe a few ultra-budget-segment 430TX boards. The move to SDRAM was a big factor there, so the EDO-only 430HX was quite obsolete by that point.