Ithil,
Thanks for that note. The 'renaissance' style of city image is an addition to the game brought with 'Test of Time' (released late 1999) which was not available when Blackclove authored his tech' tree tips. As such, you're right in that this matter is not covered in the tip, however it's simply a case of a recent addition in a newer game variant introduced after the tip's date ('April 99' as indicated at the head of the tip).
The Scenario League has since provided tips on special technology slots for Test of Time as per William Keenan's tip at
sleague.apolyton.net/Guides/sldt_tot_advances.shtml , while William and I have authored a tip on divergent technology trees for Test of Time at
sleague.apolyton.net/Guides/sldt_tot_civ2lead2.shtml . Between them, I hope that the matter you've identified has been accommodated.
I have constructed this section of the Scenario League site with the understanding that all tips pertain to the Fantastic Worlds version of Civ2 unless otherwise indicated.
Thanks for pointing this matter out - it's always nice to know that these tips are being used!
Scenario League members will note that we've recently added a 'links' section to sites with tips that are not already addressed on the S.L.'s own Design Tips section - if you have a unique design tip, please feel free to submit it to the League, or as a 'second best' option, submit the link to us. Thanks.