[Q] Question about TheMyth ICS - Galaxy Ace S5830 General

http://forum.xda-developers.com/showthread.php?t=1376039
In the above link, you can see that the "Android version" is 4.0.1
Does that mean TheMyth ICS is based on the official Anroid 4.0 Ice Cream Sandwich?
Because I thought TheMyth ICS is a stock custom ROM that's just made to look like the official Ice Cream Sandwich.
In the link above, it says:
----------------------------------------------------------------
Features in Lite version:
- Based on 2.3.5 BUKS1 (I edited version in build.prop to 4.0.1 )
-----------------------------------------------------------------
Does this answer my own quesiton? It IS based on the stock ROM (gingerbread) right? If so, is that why many users are saying that it's pretty stable? I mean compared to CM....
Thanks guys!

---

creator stated that its based on GB.. he just changed one setting to see version as 4.0.1
it is stock based rom so stable than CM

---

if you read the 1st post you will know
======================
SGSII styled rom
for galaxy ace
======================
The Serious MOD V0
for galaxy gio
======================
made by Robinandroid

---

This ROM is very stable on the velocity (my Ace has already reached 190MB free). And the battery are perfect but not perfect as stock ROM. I recommend if you like the ROM Stock, ICS, and need velocity.
PS: The games is wonderfull in the MythICS

---

madman_amit said:
creator stated that its based on GB.. he just changed one setting to see version as 4.0.1
it is stock based rom so stable than CM
Click to expand...
Click to collapse
Hello.
1.When you guys say "stock-based ROM", is that the same with "stock custom ROM"?
2. What is the difference between stock-based ROM and a custom ROM like cyanogenMod? Is stock-based ROM very much like stock ROM with only minor tweaks while cyanogenMod is like a total overhaul? and therefore stock-based ROMs are more stable?
3. The instructions for installing the ThemythICS includes "Do a full wipe" before installing TheMythROM. Is this necessary and what does it mean?
4. In http://themythace.co.cc/ , what are these steps for and are they necessary?
Step 5: Wait for your phone to boot. After it opens, You can go to menu then open Tweak Manager and enable:
+ VM Swapiness
+ DT: Auto Start
Step 6: After u finish with Tweak manager, continue to open A2SDGUI.
+ Enable Swap and Zipalign.
+ Open 2nd tab and select "sd-ext".
Press Move and wait for your phone to reboot. It will reboot several times so plz wait
----------------------------------------------------------------------------------------
Thanks guys!